Fortigate not resolving dns. Set the mode to "Fo.
Fortigate not resolving dns. In typical Active Directory scenario, your Domain Controller will be your internal DNS Server. Solution Example Scenario Setup: In a multi-VDOM FortiGate setup, DNS forwarding between VDOMs can become problematic when DNS services are bound to VLAN or physical interfaces. Solution To perform a hostname resolution from the FortiGate CLI, the following commands can be used: execute ping execute traceroute Both should return the pr Jan 17, 2007 · FortiGate’s DNS query behavior if the Default DNS configuration is not being modified and how to resolve if the DNS query failed. Remediation Steps: Review the cause for the DNS resolution not … Oct 3, 2024 · how to resolve an issue related to DNS and FortiGuard communication issues that occur after upgrading from FortiOS versions 7. 8 set secondary 1. Solution When connected by Web Mode of SSL VP May 23, 2025 · that in the Web GUI under Policy & Objects -> Addresses, all FQDN Address Objects may show unresolved 'Unresolved FQDN' when highlighte Apr 28, 2025 · how DNS forwarding should be properly configured to function between VDOMs. 4 cluster upgrading to 7. The DNS server is running inside Fortigate itself. 15. 9. 2, v7. These two users are often not able to resolve hostnames. May 28, 2020 · how to troubleshoot when hostname is not accessible over IPsec VPN tunnel or SSL VPN connection. Dec 19, 2022 · how to make the web mode SSL VPN resolve the internal DNS. Having issues with major latency to Fortigate DNS servers and DNS filter servers causing website access issues for users. If the resolution does not work, refer to the following related KB article. You can check DNS settings in the CLI under " config system dns". Solution DNS over T I'm very new to the Fortinet world and I'm working on configuring my FG100F. Alternatively, to match the SD-WAN rule for DNS traffic, the source addre Jun 9, 2025 · I have a FortiGate 70F running 7. Has anyone else had trouble with excessive latency with Fortigate? I have four FortiGate deployments from various branches, and they all have the same problem: DNS is unreachable. However, it seems that someone might have assigned the same internal DNS name externally, leading our internal DNS to mistakenly direct to external addresses. The DNS, which is specified on the Network -> DNS -> DNS Set Oct 14, 2021 · Some of you may have noticed that a Fortigate – configured to use the FortiGuard DNS Servers – is not resolving some DNS names anymore. ScopeFortiGate DNS feature version 7. If I point it to my internal DNS running on the domain controllers it completely fails. Dec 9, 2024 · Wildcard FQDN address objects do not instantly resolve the names like non-wildcard objects. 43. gov. Solution Scenario: 1) The local DNS server will be used to resolve only the local name server, 2) Global DNS server, in this case, FortiGuard DNS server, will be used to resolve global DNS query. Please use your local DNS server on FGT instead. 17. While VPNing in from FortiClient or FortiClient VPN on an iOS device (iPhone or iPad), the client was never able to resolve any FQDNs. May 2, 2023 · Problem is i cant resolve DNS names neither from the clients side when connected through the ssl vpn tunnel, nor from the command line of the FGTs. Solution If default DNS configuration is not being changed, FortiGate-initiated DNS queries may fail because of the address resoluti DNS troubleshooting The following diagnose command can be used to collect DNS debug information. Set Type to Primary. Scope FortiGate v7. Main-Site (FG 601F) has some internal DNS zones with entries and some of them forward to other DNS se that DNS packets are not sent out by the FortiGate after applying'"interface-select-method sdwan' in DNS configuration. Is Nov 19, 2023 · Hello fellows! In a FGT-61F I created a local DNS service for domain "local. But after some time. The customer is using their own DNS server so they are resolving the domain to an IP using that DNS server instead of through the Public: This type of DNS zone is intended to serve external clients only, allowing them to resolve DNS queries with the non-recursive DNS server on FortiGate. com" I think I know why it's not matching it but I'm not sure of the resolution. The address objects will cache the IP fo an issue that may arise when FQDN addresses are used in conjunction with a local DNS Database. on the Fortigate On dns I specify my dns server as primary server and the Local Domain Name. Currently our Fortigate is configured with Aug 9, 2023 · the behavior of a FortiGate v6. If the public is used, like FortiGuard DNS, then the private hostname will not be resolved. May 26, 2022 · Hi, a few days before, we made the Update 6. - I have created a virtual IP (VIP) on the FortiGate. In an enterprise environment, most of the organizations do have internal DNS servers. Related articles: Technical Note: FortiGate Troubleshooting DNS commands. Scope FortiGate, FortiGuard. The DNS server is necessary to resolve domains/URLs to IP addresses. tld" with some A records in it. Internal users are unable to browse the specific website www. Solution In some use cases, users need FortiGate to respond to local DNS queries. Jan 19, 2025 · how to use the FortiGuard DNS server for Domain Name resolution. 16. 4 and have configured DDNS with FortiDDNS on three devices: two FortiGate 40F units and one FortiGate 60F. May 27, 2020 · how to configure DNS over TLS. Solution Here, the TS Agent user information is present in the (# diag firewall auth list) output, TS Agent has allocated ports 1025-1224 and 1225-1424 to it: Firewall policy: Dec 28, 2020 · Even setting a dns forwarder would require the client to use the FGT interface ip as DNS Server. But thats just how I have it setup. 2 FortiGate v5. - My public IP is not pinging. Here’s the issue I' Jul 14, 2023 · While I understand your disappointment, your conclusions are not entirely correct: DNS Filtering is not related to Web Filtering in any way. COM via it's local DNS (thus not using the split-DNS option). Oct 6, 2008 · OK, 1) First of all for DNS issues: Add your local DNS Server Addresses in VPN --> SSL --> Advanced --> DNS Server#1 and DNS Server#2 (if you have a secondary DNS Server) (This should be the IP address of your internal DNS Server which is responsible for resolving the host names to their LAN IPs. Nov 6, 2017 · FortiGate not resolving DNS Hi. 112:52/53 set on your ens33 nic. If I ping the IP-Address the FG is working fine. ScopeFortiOS. Set View to Shadow. Sep 13, 2021 · This article describes that in some cases, the network does not work because the DNS server is down or intermittently available. domain. A FortiGate uses IP Addresses (amongst other things) to match firewall policies, so if it cannot Jun 27, 2025 · Use case of source-ip in dns-database (see Technical Tip: How to control/change the FortiGate source IP for self-generated traffic: ( If this DNS request should be sent to DNS forwarders or the Local DNS servers either via the local network or VPN: Again, make sure that authoritative is 'DISABLED'. Dec 20, 2024 · This article describes the issue when the DNS server is not resolving certain domains when the DNS database is configured. 3 without troubles. A common side-effect of this issue is FortiGate being unable to reach various FortiGuard services due to name-resolution issues. 8. x execute ping Client A = unable to resolve host name. All clients inside my LAN, laptops, desktops and servers all use the 2 Windows DNS servers for DNS. It is used to resolve Hostnames/Domains into Routable IP addresses. May 14, 2023 · Forticlient MAC - DNS not resolving internal hostnames Probably since thursday when our VPN (Forticlient 7. Fortinet public dns is 208. This article shows a common issu Hello there, My FQDN addresses sometimes cannot resolve names over firewall. To verify the FQDN addresses and their resolved Mar 6, 2024 · Hi all, I've never used the DNS server on Fortinets before but we've got 2 VLANS, a guest one and a DMZ one and i need to be able to set the devices on the guest network to use the fortinet (100F) as their DNS server so that i can set a domain like dmz. example. Solution Support for wildcard FQDN addresses in firewall policy has been added in FortiOS 6. ScopeFortiGate, FortiEMS, FortiClient, ZTNA. 34 secondary = public dns 151. The 'Unable to conne Nov 25, 2019 · I have been working on a Fortinet FortiGate deployment recently and encountered a major issue. Solution DNS definition. The FQDNs that are giving us the most trouble are on cloud or DNS troubleshooting The following diagnose command can be used to collect DNS debug information. Solution FortiGate devices can be configured to use DNS forwarders for resolving domain names. 2, or 7. how to verify the resolved and unresolved FQDN entries in the FortiGate DNS cache. In general the VPN is working great and there are no connectivity issues at all. 0MR7 build 0750 Network is s Aug 17, 2024 · This article provides information about useful debugs related to DNS and general DNS information. 2. Scope FortiGate and FortiGate VM running FortiOS 7. Solution There are some steps to configur Jun 9, 2025 · Fortigate internal DNS server not resolving internal host names I have a FortiGate 70F running 7. local asd (should work because test. - When the Internal DNS serv FortiOS supports being configured as a recursive DNS resolver. Jun 11, 2025 · that there are multiple ways of using the DNS in the FortiGate environment. Not 209. May 1, 2025 · I installed Forticlient VPN 7. Authoritative DNS servers that are not compliant with RFC 6891 (https://datatracker. com ' what is sent to the DNS server set by FortiGate settings is microsoft. All my internal machine use their network's interface IP as the DNS server but i don't see an interface IP for SSL VPN. Jun 15, 2023 · The DNS server is reached and can resolve names (policies ok) but it looks like Windows refuse to use this as valid DNS server. This is beneficial when you need to rely solely on system-level DNS resources for resolving queries. To configure FortiGate as a primary DNS server in the GUI: Go to Network > DNS Servers. I have tried network reset (Windows 10), uninstalling and reinstalling Windows client. So if you want to be able to resolve your hostnames from out of the vlan you need to make sure the clients can access a dns that can resolve these and that the clients use this dns! Feb 17, 2025 · Hi @danyal , If the FQDNs are local and private, most likely any public DNS servers do not know how to resolve them. The VPN correctly sets the DNS on all of their connections and I can see the DNS requests in the firewall log. Oct 21, 2022 · DNS Name Resolution does not work for all internal zones (IOS) Hello, we have a Fortigate v7. 1) FortiView On FortiAnalyzer, for FortiView widgets, using DNS resolution to Jun 27, 2025 · what to do when the TS Agent FSSO users are unable to resolve DNS. I get the error Oct 2, 2022 · how to implement split DNS for Local and Global domain. If it were cache related you Mar 19, 2025 · DNS Filtering allows us to control/filter DNS queries crossing the Fortigate from clients, this way preventing DNS resolving the names to IP addresses for malicious/unwanted domains. We have two fortigate 60B, connected via IPSEC VPN, with the DNS server in our office, remote branch could not ping our servers here via its name (ping MYSERVER --unable to resolve host). DNS resolution can be seen to fail. Mar 12, 2020 · Entering in the fqdn of the DC into the server field does not work because the Fortigate does not resolve the name to an IP address (a DNS resolution failure). Unlike standard FQDNs, the wildcard FQDN is updated when a DNS query (response) traverses the FortiGate. Jul 20, 2022 · how to identify and solve DNS issues while provisioning Free FortiToken. After setting a DNS suffix through the CLI everything works as intended for all but 2 users. Internal resolvment of FQDNs between PCs (witch are not domain joined,works fine) As you can see in the print screens provided, i have for the FGT targeted, the Fortinet DNS server as option 1 and Nov 12, 2024 · how to troubleshoot the 'cannot find SDNS server (error allow domain=<url>)' error when a DNS filter profile is applied on FortiGate Oct 29, 2010 · On port1 (lan) Enable DNS Query recursive is set Network > Options DNS > primary = 192. Using the Ldp utility from my desktop I get a similar result, I can connect via LDAPS just fine if and only if I use the DC hostname/fqdn. ScopeFortiGateSolution On a FortiGate that uses an FQDN address object in firewall policies, issues will arise if the FortiGate is unable to resolve the FQDN to an IP Address. All clients using the fgt as their primary DNS server and can resolve all hosts in "local. local is set in the Local domain name in DNS) test. ScopeFortiGate. the vpn works fine Jul 31, 2025 · a solution to resolve the IP address for Wildcard FQDN. lo (that's the name from our Point your Fortigate DNS to an internal DNS server. Wheneve The appliance will query the DNS servers whenever it needs to resolve a domain name into an IP address, such as for NTP system time, FortiGuard services, or web servers defined by their domain names (“domain servers”). Solution - Internal DNS is deployed on Azure, and FortiGate virtual appliance is securing, the inbound and outbound traffic of the DNS server. Jun 7, 2025 · Fortigate internal DNS server not resolving internal host names I have a FortiGate 70F running 7. 4 to FortiOS 7. I am trying to set the main DNS server in System -> Network -> DNS -> Primary and Secondary DNS Server entries. It can be used with a firewall policy as well as from a DNS server recursive interface. It was driving me the '504 DNS lookup failed' error when using FQDN to access the ZTNA server. In most firmware versions, split DNS is enabled by default when split tunneling is selected. It is not a standalone DNS server. how to resolve the issue with internal DNS causing the HA failover from primary to secondary VM on Azure to fail. So we finally forced out the old outdated vpn and have all vpn users using fortigate VPN. If you do not specify worker ID, the default worker ID is 0. From the CLI I am able to successfully ping the DNS server IP's with sub Hi everyone, I have been working on a site-to-site IPsec VPN connection and I am having issues resolving dns back to the main Fortigate (501E) from a FortiWifi (60E). Nov 4, 2021 · FortiGate 60D firewall. I am using FortiSwitches connected via FortiLink for clients on multiple VLANs. Specifically, this happens when the VPN portal is configured to use split DNS. Aug 8, 2025 · how a DNS filter works and the options available to apply a DNS filter profile. 8 as my primary, and 1. On my remote pc , When I'm connected with the VPN I p Oct 17, 2024 · how to troubleshoot if the internal DNS server fails to resolve any FQDN. 0 (build 3401), due to a bug. should I set the DNS on the Fortigate to the ISP or a specific Fortigate server? Seconded. Wildcard FQDN shows an unresolved IP address and the user is unable to access the URLs if tha The only other piece of information I have is that the FortiGate is resolving to an ISP DNS server, while Server1 is responding to our internal AD DNS server, which has no forwarders enabled (so it forwards to the root servers) My first reaction is "the server and Fortigate should both be resolving against the same DNS servers". com. Solution When trying t Jan 22, 2018 · It is possible that your FortiGate is not configured to resolve the IPs to hostname when generating the logs. Solution FortiGate can only intercept or block a DNS query if the DNS request is coming to the FortiGate itself or Sep 4, 2024 · Wildcard FQDN address objects do not instantly resolve the names like non-wildcard objects. Basically this setup should work as it was Jan 2, 2023 · Hello, There is a DNS error " dns resolve error " in the bottom of the last screenshot. 91. How can I solve this problem? Can I solve it by running a command in any CLI? Thanks. Solution The FortiGate firewall automatically maintains a cached record of all the addresses resolved by the DNS for the FQDN addresses configured. Jun 12, 2024 · This article describes an issue that may arise when FQDN addresses are used in conjunction with a local DNS Database. 0. Upon investigat Jun 2, 2017 · DNS troubleshooting The following diagnose command can be used to collect DNS debug information. The FortiGate uses DNS for several of its functions, including communication with FortiGuard, sending email alerts, and URL blocking (using FQDN). 168. config system dns set alt-primary {ipv4-address} set alt-secondary {ipv4-address} end Alt-dns servers are how to create a DNS database for a website that is hosted in the local network. The below ste Jun 9, 2025 · Fortigate internal DNS server not resolving internal host names I have a FortiGate 70F running 7. Scope FortiGate and SSL VPN Web Mode. ScopeFortiGate, FortiToken. DNS Filtering kicks in first, when a client sends DNS query that FGT sees. In the DNS Database table, click Create New. Solution If resources are not accessible across a VPN tunnel by hostname, try the following steps: Make sure to set up the DNS server properly when configuring SSL or IPSec VPN. Dec 26, 2024 · This article indicates that the wrong IP was resolved for FQDN. It is a hierarchical and decentralized system and usually runs on port 53. Feb 21, 2025 · how to create a local DNS database and make FortiGate respond to local DNS queries. Jul 25, 2022 · The internal private records. To configure the DNS database, refer to this document: FortiGate DNS server. 2. Solution Local DNS servers can be created for a network. ScopeAll FortiOS. x to v7. - Use the internal DNS server of the FortiGate to either redirect all queries of the FortiGate and clients to your DNS servers alltogether. When using the FortiGuard Servers for DNS I'm able to resolve public domain names. 7. Aug 15, 2020 · the scenario where an SD-WAN rule for locally generated DNS traffic is configured with the source address, the traffic will not be matched to the SD-WAN rule unless 'source-ip' is not defined under ‘config system dns’. 0+. A FortiGate uses IP Addresse Public: This type of DNS zone is intended to serve external clients only, allowing them to resolve DNS queries with the non-recursive DNS server on FortiGate. ScopeFortiGate. Policy 2: WAN to LAN with NAT Dec 10, 2018 · 3 Can you advise on moving to a hybrid DNS? Currently, all our LAN machines receive their IP address from our Fortigate 60D (each machine is either allocated an IP address from the Fortigate DHCP, or has a static IP address set in the Fortigate). Set the mode to "Fo Monitoring the Security Fabric using FortiExplorer for Apple TV Troubleshooting Log and Report Logging to FortiAnalyzer Advanced and specialized logging Troubleshooting WAN optimization Overview Example topologies Configuration examples VM Hyperscale firewall Troubleshooting Troubleshooting scenarios Change Log Home FortiGate / FortiOS 7. The current work around was editing the /etc/hosts but that is an AWFUL work around. 772/4. com and add an entry such as server. Scope FortiOS 7. He also can ping the DNS. Our DNS records are currently managed from fortiddns. Solution alt-primary and alt-secondary servers are configurable from the CLI. I' m surprise that fortigate does not have this function. Sep 18, 2018 · The other option i have is to specify a DNS server but i am stuck here as i am not sure what is the IP i should use. Aug 19, 2024 · how to resolve an issue with a DNS server hosted on the other side of a firewall and connected via a tunnel where the local domain does not resolve. However, the PC can connect using the same DNS. . As a resolver, the FortiGate can directly interact with root name servers, Top-Level Domain (TLD) name servers, and finally authoritative name servers to resolve DNS queries. I suspect Microsoft DNS servers responded with this Greek IP for a short time but Fortiguard DNS servers cached the response for too long. It is possible to configure the FortiGate to access a public DNS for resolution. After this, the FG can't resolve any Hostnames. One of the benefits of this is saving FGT resources - attempt to access bad website is blocked on the DNS resolving level, even before any HTTP request is sent, and before the Web . Fine. Consequences can be that FQDN address objects can not be resolved or a configured mail server can not be used anymore. 112. FG60B-V3. I’ve enable our DNS server on SSL vpn settings , if there is any thing else let me know. Solution DNS over TLS (DoT) is a security protocol for encrypting and wrapping DNS queries and answers via the TLS protocol. I Aug 19, 2025 · that, when the custom DNS server is used under System -> DNS, the internal DNS stops working and will also result in FortiGuard being unreachable. Jul 21, 2017 · This article provides a solution to DNS resolution not working when DNS Server is configured to "Same as Interface IP". Jun 30, 2021 · FQDN address objects that are used in firewall policies that are not working intermittently. The system DNS is pointing to the FortGuard DNS servers. tld" with their FQDN. If it's a public IP, the DC or DNS server should forward the request back out. DNS servers were set, split-tunnel was enabled (with the correct domains/subnets selected), and the VPN was working with Android devices perfectly. Scope For all supported Fortios versions from v6. If I set the system DNS servers to our internal ones, I can resolve the host names but PING still fails. We're having issues with one of our point-of-sale networks that has a whitelist that is almost all FQDN-based. Jul 17, 2023 · While I understand your disappointment, your conclusions are not entirely correct: DNS Filtering is not related to Web Filtering in any way. 0, 7. There most likely was an issue which is now already resolved. 0245) is connected we have assigned local DNS but when trying to access or ping some internal services/servers it doesnt resolve. Under normal behavior, when connected to IPSEC VPN, FortiClient manually sets the local adapters DNS settings, then when you disconnect it changes the DNS settings back to auto. com (wh Comprehensive guide on troubleshooting DNS issues in FortiGate, including diagnostic commands and resolving common problems. We didn't cha Jan 6, 2025 · The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges. The issue is, it sometimes does not change them back to auto, so then when the client connects to another network with different DNS servers they have no DNS resolution. Now I want to use this working FQDN resolution for some firewall polic Feb 15, 2012 · Cisco ASA has a split-dns feature that get' s thru these issues hurdles and allows the client to resolve only domainnames allowed for that vpn client. Apr 28, 2022 · Your DNS server seems to be set to forward-only, which will only forward to the public DNS configured, without checking the local database. So in case the listening interface gets a DNS query it should respond with the local database A records. 53 Secondary: 208. Don't bother with a server\relay, just use public sources, unless the computers need to find each other\printers with hostname resolution. Solution Scenario: Although the DNS server was reachable (pingable) across the tunnel, the domain was still not resolving. When multiple DNS forwarders are specified, FortiGate follows a sequential order for resolving queries rather than distributing requests in a round-robin fashi Aug 21, 2024 · the conditions under which wildcard FQDN address objects get populated. Sep 9, 2022 · It is assumed that the FortiGate unit has a valid private or public DNS configured. Currently, I am unable to ping the LAN on the 60E from the 501E and vice versa. Aug 16, 2023 · The symptom is that machines connected via VPN can only resolve names from records in the primary AD integrated zone. 1. 2-) I delete the FQDN address and add it again. If you run only > nslookup fortinet. Solution After checking the IP address resolved by the command: diagno Nov 6, 2017 · FortiGate not resolving DNS Hi. 0 build 3401. 10) with a LAN with a windows domain with 2 windows servers acting as DNS servers. 2, 7. 4, v7. Sep 22, 2023 · the FortiGate alt-primary DNS server feature and its configuration. 6. only 1 user on a mac has this issue, they are on MacOS Ventura Fortigate is 7. ScopeFortiGate, Window Server. Just my interpretation of the version 7 admin guide. 52 In your Linux config, you have 209. I'm not sure what version you're on but ours is under Network > DNS This way if there's an internal record, it will reply with that, if not it will forward it out. The problem is that these DNS Server IPs are pingable from the CLI, and traceroute shows they go from WAN1 -> loca Jan 7, 2024 · Hi Everyone My users are unable to access hostname on Forticlient , only Ip addresses. Policy 1: LAN to WAN with NAT enabled. The WAN interfaces on all devices use IPv6, and each device has been configured with FortiDDNS using different domain names. and we don't know exactly yet how long, but maybe 30 minutes or so, their application can't resolve it anymore. Ping with FQDN on FG CLI says "unable to resolve hostname". If FortiGate is used as DNS server, then the clients will also not be able to resolve DNS. Sep 22, 2023 · the troubleshooting steps if the DNS is showing as not reachable in a multi-VDOM environment. An internal dns server is specified in the ssl vpn settings. 2 Nov 4, 2017 · Hello, I would like to resolve internal hostnames on my network, and I read on this Forums that it would suffice to set your internal DNS as the primary DNS server on the Fortigate unit in network configuration. You are also serving out what looks like other incorrect DNS on your dhcp or static in your Linux. Don’t bother with the dns server on the FortiGate. HW is 1500d. I can connect with FortiClient VPN without problems. 499/3. Jan 4, 2024 · This statement may not be correct, what you explained is the Recursive mode behavior. I did some research and found the articles that talk about matching the client and firewall DNS servers. dmz. The FG GUI either reports very high ping latency or unavailable. com , which DNS server does respond to the query? Aug 16, 2023 · Hello, I have some issues with dns forwarding between to fortigates (601E and 601F) over a site to site VPN tunnel. The DNS settings in my Fortigate 201F are causing me a headache. 7 and we dial into the company via vpn from Windows, Mac, Android, iPad, iPhone. 4,build1117 Problem: FG does not resolve dns queries DNS Servers are defined in global mode (global>network>dns > server1, server2) DNS Server are defined in VDOM mode (vdom-x > network > dns servers > Service on inside interface, Forward requests to system dns) i do not see any requests. This is the most accurate approach. Dec 19, 2009 · Hi! I am having some problem with the DNS resolution on our remote branch. By default, FortiGate uses FortiGuard's DNS servers: Primary: 208. Make sure to check the endpoints connected and what has been assigned for dns servers. 10 the VPN has the correct DNS setup, and the Mac even uses the right dns address, but can't resolve any domain names. For example: myfirma. May 23, 2010 · how to resolve a hostname to the IP address from the FortiGate CLI. Feb 18, 2025 · Hi @danyal , If the FQDNs are local and private, most likely any public DNS servers do not know how to resolve them. I configure the vpn. There are only about 5 computers that will be using this tunnel and maybe 3 printers. SolutionEnable the DNS Database Feature. Fortigate and wildcard domains I've got an issue where a Fortigate policy isn't matching a FQDN based on a wildcard like "*. FortiGate. Jun 7, 2021 · Note: If the DNS query from an endpoint is made to an internal DNS Servers and this DNS traffic does not pass through the FortiGate, then the query from the DNS Server to the Forwarder (could be internal or external), to resolve the FQDN has to go through the FortiGate, so FortiGate can cache the resolution and update the wildcard FQDN object. i Jun 6, 2025 · Fortigate internal DNS server not resolving internal host names I have a FortiGate 70F running 7. The DNS Servers have been reading unreachable from the 60E. Solution This article goes over t Jan 25, 2019 · Client has 5 offices, 1 domain controller, all connected with Fortigate Firewalls via ip-sec vpns Main office (where the only DC is) has no problem with pinging machines by name and returning IP *Satellite vpn connected offices use DHCP from Fortigate LAN, DNS on Fortigate LAN interface is pointed to IP of DC at Main Office, machines can successfully join domain. local How can I fix this? Solved! Go to Jul 7, 2023 · It would appear that you can set up the fortigate to use your AD server as it’s dns server, then add your AD domain as a default domain, then have your clients use the fortigate as a dns server and the fortigate will add the AD domain to requests it receives for host names. Jun 9, 2025 · Fortigate internal DNS server not resolving internal host names I have a FortiGate 70F running 7. If the system DNS servers are set to use the Fortinet servers (or any other external DNS servers), I'm unable to resolve any host names. ph Jun 1, 2024 · Network Setup: - My FortiGate device is configured behind an ISP router. 1. The connection looks fine and I get access to the intranet of my company when I use the exact IP number, but I cannot use names. ABC. *Problem: Satellite offices Hi everyone, I'm using FortiGate version 7. Solution Problem Statement: FortiGate is configured with an internal DNS (primary) server and a FortiGuard server (secondary). 4. 0 and above. The goal of DNS over TLS is to increase user privacy and security by preventing eavesdropping and manipulation of DNS data DNS works perfectly fine when FortiClient is connected. There are different zones/domains in our internal DNS. My suspicion is, that the WindowsOS (in this case) has tried to resolve the record of example. test. 14. Mar 24, 2025 · as how the DNS forwarder works. As also mentioned in the admin guide : Forward to System DNS: The local DNS database is bypassed and all queries are forwarded directly to the system’s DNS server. ScopeFortiGate 7. Warm Regards Feb 17, 2025 · Hi , If the FQDNs are local and private, most likely any public DNS servers do not know how to resolve them. Mar 27, 2024 · We essentially want to have clients query for local network devices on the DC and all web requests through the Fortigate by their IP so certain users can have DNS Filtering Applied while others don’t have it applied. It’s possible even with these global settings your interfaces have override system dns enabled and are handing out the ISP dns or something else. Mar 25, 2020 · I'm having trouble getting one of my Fortigate 200Es to be able to resolve hostnames. 1 as my secondary, but both are still unreachable. After upgrading to FortiOS 7. 4 and above with the default FortiGuard DNS server configured, specifically an issue where the public IP (on the Azure side) of the external interface (on the FortiGate side) has not been moved to the correct primary cluster FortiGate member. Solution Sometimes, when trying to assign a FortiT Mar 27, 2023 · I have a Fortigate 201F (firmware 7. BUT, I would also like to have the Fortigate be the first DNS uplink for my in Sep 8, 2020 · how hostnames (A-records in this example), are resolved using the DNS servers configured on the FortiGate. Fortigate DNS KB ID 0001796 A colleague rang to ask if I had any thoughts about a problem that they were having, we do a lot of VMware VCSA upgrades for customers, the process fails if there is no DNS resolution of the FQDN during the upgrade process. Instead, for wildcard objects, the Fortigate watches DNS queries as they pass through the firewall and it sniffs the IP addresses that are returned from DNS servers. For the setup: Dec 9, 2024 · The Fortigate at the hub site sees the traffic because the DNS server forwards the request to a public DNS server and gets a response, so the hub Fortigate is always up to date. One of the benefits of this is saving FGT resources - attempt to access bad website is blocked on the DNS resolving level, even before any HTTP request is sent, and before the Web Oct 8, 2019 · Hello I'm beginner with fortinet product. Configure a DNS Server for the interface that DNS requests will be sent to. To resolve Destination IP on the FortiGate config log setting set resolve-ip enable end But FortiAnalyzer can resolve the IPs for FortiView & Reports, just not Log View. - There are two firewall policies in place: 1. In general, I organize the problem as follows; 1-) I restart the DNS server. Solution The below screenshot is taken from Network -> DNS. x. bsp. If the name Oct 25, 2022 · the possible reasons why FortiGate is unable to connect to FortiGuard servers and offers steps to troubleshoot the problem. 1, the You can: - Point the clients directly to your DNS servers through DHCP (and a firewall policy, if applicable). com resolves to 13. All rules that use FQDN doesn't work anymore. I am currently using Google DNS 8. Solution Symptoms and Cause: After upgrading, D Apr 24, 2012 · Hi, The FG-100D units are in a A-P HA cluster on v4 MR3 Patch 6 firmware. 4 FortiGa May 20, 2025 · round-trip min/avg/max = 3. As soon as I connect and do 'nslookup microsoft. Since this is a test environment and ips have changed I did a config system arp-table purge Any other trobulehsooting ideas? DNS troubleshooting The following diagnose command can be used to collect DNS debug information. It contains records that map the domain names of your publicly accessible services to their respective IP addresses. 1 end Note: When changing to a new DNS server, it will still have a cache (10 minutes) of the previous server until it is cleared. Scope FortiGate. 7 and I'm trying to set up a DNS server on it to resolve some internal server host names. Diagra Jun 9, 2025 · Fortigate internal DNS server not resolving internal host names I have a FortiGate 70F running 7. Scope FortiGate Solution On a FortiGate that uses an FQDN address object in firewall policies, issues will arise if the FortiGate is unable to resolve the FQDN to an IP Address. Depending on the specific requirements, entries can either be manually managed (via a primary DNS server) or configured to reference an ex Set interface DNS to 'use system' and system DNS to Forti or 8. Oct 21, 2024 · Hello We are running into issues with FDQNs we enter in the address section of the Fortigate resolving to different IPs than our client computers. 8 to 6. TS Agent. Apr 22, 2024 · How can we set up FortiGate DNS to resolve all internal hosts internally? At the moment, we've set one of the DNS servers to 8. - I have set up DDNS on the FortiGate, but it is not working. 043 ms Check if the DNS server is configured correctly, or isolate to use a public DNS server Wira-kvm20 # show system dns config system dns set primary 8. local and of course this fails. Solution When a FQDN-based destination address object in firewall policies is used, whenever incoming traffic coming from LAN to WAN, it should hit the configured firewall policy with t Apr 28, 2022 · The firewall doesn't respond to DNS for this domain and forwards the request to other DNS servers instead of resolving it from the local database I tried dig for these domains and all of them failed to resolve: asd. I try to configure my FortiGate 50E. ) 2 Jul 20, 2009 · the different debug information that can be collected from the CLI of the FortiGate. FortiGate is using FortiGuard servers along with dynamically obtained DNS servers (from ISP) as DNS servers. DNS troubleshooting The following diagnose command can be used to collect DNS debug information. You can doublecheck this behavior with the CLI: # exec ping <some-dns-name> Technical Note: DNS resolution not working when DNS Server configured to Same as Interface IP Products ProductsFortiGate v5. But the branch Fortigates do not see that traffic, I'm assuming because they don't watch IPSEC VPN tunnels to sniff DNS traffic? Nov 19, 2018 · DNS lookup failure (s)-fortinet-FortiOS Vendor: fortinet OS: FortiOS Description: Indeni will alert if the DNS resolution is not working on the device. Firmwae v5. urpvjsp padi vezpbrr nkoj sghcgtm gmek rrvgqs najtr bfm iatxw