Fortigate ipsec esp error 10 is the FortiGate initiates traffic. VLAN interface, Physical interface) except for the Loopback inter Mar 21, 2024 · Hi @b. ESP packets can be captured from the GUI under Network -> Packet capture or from the CLI with the following command: diag sniffer packet any "esp and host 10. es Feb 21, 2023 · To determine whether the above issue is being encountered, run the following CLI command on the FortiGate device to initiate a packet capture of ESP packets (protocol 50): # diagnose sniffer packet any "proto 50" 6 0 l . I created policy like this: config firewall local-in-policy edit 1 set intf "wan1" set srcaddr "s2s_name" set dstaddr "all" set action accept set service "IKE" "ESP" set schedule "always" set status Mar 14, 2022 · Is your IPsec bounded to an loopback interface on the Fortigate ? If so, please make sure you have IPv4 policy to allow traffic between the loopback and the wan interface. はじめに 本設定ガイドでは、FortiGateを使用して、ニフクラ上に構築した自社の環境にIPsecを用いて安全に接続す る方法を詳細に説明します。ルートベースのIPsec確立トリガーで、IKE v1およびv2によるIPsecの認証を Jan 1, 2013 · Hi all Im trying to install a site to site IPsec between 2 different routers (Cisco 3750 & Fortigate 100A) (R1 & Fortigate100A) with out installing IPsec, the whole scenario is working properly. Mar 23, 2024 · But there are only empty lines. 4, ESP packets with unknown SPI values could not matched by the local-in-policies. With our FG are 5 IPSec sites connected, but the traffic between our Router and the 5 tunnels is minimal(per tunnel about 8 MB a day). As FEC re-transmit some packeges, this makes sence to me, as an ESP packet with a sequence number could be re-transmitted. Apr 13, 2013 · Foro NO OFICIAL de soporte en castellano de productos de Fortinet: Fortigate, Forticlient, Fortianalyzer, Fortimail, Fortibridge, Fortiguard, esp_error/IPsec ESP/ VPN IPsec - Página 2 - Comunidad FORTIGATE. The FortiGate GUI shows that the Tunnel is UP, but on the Cisco it's still not working. See the following IPsec troubleshooting examples: Understanding VPN related logs; IPsec related diagnose commands IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets 1597163320747963100 tz="-0700" logdesc="IPsec ESP" msg="IPsec ESP" action="error" remip=131. I don' t remember the version of FortiOS 网络拓扑. Open the packet capture that is taken from initiator FortiGate using Wireshark, go to edit -> Preferences, Expand Protocol and look for ESP. 73 is a MikroTik based IPsec endpoint. The following is a Mar 17, 2025 · FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. This could happen due to a number of factors, possible causes are: May 4, 2015 · To my knowledge nothing has been changed on the firewall/router. Need a help with configuration local-in-policy to blocking IPsec from not known sources. any suggestion would be great Im using Fortigate 100D at m Oct 25, 2022 · FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. 4 and above, the ESP sequence numbers are synchronized between master and slave nodes depending on the parameter from the Phase1 configuration 'set ha-sync-esp-seqno enable | disable' (enabled by default). To confirm errors are increasing on IPsec VPN interface(s), periodically issue one of the below commands: A) fnsysctl ifconfig <Phase 1 name> RX packets:0 errors:0 dropped:0 overruns:0 frame:0 Dec 6, 2014 · FortiGateではIPsec/SSLでのVPNが可能ですが、 VPN設定のどこでミスってるか分からないけど繋がらない ってことがあるかと思い Nov 14, 2018 · Invalid ESP packet detected (payload not aligned). Solution . These SPIs are created when an IPsec tunnel is formed between two endpoints, and also these SPIs are recreated whenever the VPN Aug 19, 2015 · Now I see that in the log are often these two errors: - IPSec DPD failure(dpd_failure ) - IPSec ESP(esp_error) - Recieved ESP packet with unkown SPI . Nov 20, 2022 · FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. Scope: FortiGate. 62 Bug ID. Since mode-cfg (the feature responsible for leasing IP addresses) is disabled under the Phase1 settings of FortiGate, the FW was unable to respond to the request, resulting in the Peer unit re-transmitting the IKE message, and eventually, the negotiation timed out. I get the occasional ping back but majority is Request Timed Out. If there is ESP fragmentation, for example: The original direction traffic is fragmented, but the reply traffic is fine. Sep 13, 2024 · This article explains the available IPsec VPN modes in FortiOS. In the ESP header, the sequence field is used to protect communication from a replay attack. Description. 1. Feb 21, 2025 · show full system settings | grep esp set detect-unknown-esp enable . In FortiOS V5. I have tried to recreate the tunnels but same error. 11) and a Fortigate 60F (current FortiOS) device. The VPN tunnels on both devices will show up but no traffic is passing. I own an older Model (60C) and run the lastest available Firmware 5. gorsky,. To fix the issue I have been clearing the phase1 and phase2 connections on the Palo. Enable the 'fortinet-esp'. I’m not familiar with the brand yet and I’ve seen a few attempts to connect to it from foreign IPSec tunnels (we have a network of IPSec tunnels to remote office routers). Solution: To clear out the stale UDP session, IKE traffic must be stopped completely until UDP session timers expire on problematic routers. Anything sourced from the FortiGate going over the VPN will use this IP address. Tunnel mode. Tunnel mode is the default mode selected when a VPN is first configured. Please refer to section ESP Security-PFS Enabled on pages 215-216 in the Software Configuration User Guide for AirLink LX40, the document I provided to see if it helps you. 186. Následuje orientační popis Feb 17, 2010 · Hi All, Having issues in accessing the outlook when connected to IPSec VPN. Oct 1, 2018 · Hello, We have an issue with a vpn connection between our fortigate 1500 5. If a packet arrives at the firewall and the difference of the sequence number with the previous packets is larger than the replay window size, then it will be considered as an attack and dropped by the firewall. Apr 14, 2021 · I've tried to put together a brief description of how the IPsec protocol works for establishing VPNs. Machines on a remote network that can run FortiClient (Windows and Mac machines) have no problem Nov 30, 2010 · CISCO PIX crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac crypto map outside_map 10 match address outside_cryptomap_10 crypto map outside_map 10 set connection-type bi-directional Crypto map outside_map 10 set peer (fortigate ip) Crypto map outside_map 10 set transform-set ESP-3DES-SHA crypto map outside_map 10 set security Jun 2, 2016 · ha-sync-esp-seqno under IPsec phase1-interface settings. IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets 1597163320747963100 tz="-0700" logdesc="IPsec ESP" msg="IPsec ESP" action="error" remip=131. The error I am getting is IPSEC ESP error. Another useful output will be: Apr 14, 2020 · I have tried various other ESP propsals with the same result, including: no esp= line; esp=aes256-sha2_256-modp2048! esp=aes256-sha2_256; esp=aes256-sha2_256! esp=aes256-sha1-modp2048; I've also tried setting sha256_96 = yes in ipsec. Dec 11, 2024 · I can reproduce the TX errors with an SMB transfer (on Windows). (Pls look a Aug 15, 2023 · You may consider to bring IPsec tunnel interface down. The packet will have failed to pass validation so it cannot be decrypted. g diag sniffer packet wan1 " udp and port 45 With caching enabled (the default), a single NP6 processor can run multiple IPsec engines to process IPsec VPN sessions terminated by the FortiGate. You must manually restart your FortiGate after disabling or enabling ipsec-inbound-cache . Mein Labor sah wie folgt aus: Die FRITZ!Box ist eine 7390 mit FRITZ!OS 06. " this indicates that FGT received the ESP packets with seq No which it already received on an existing IPSec SA. x, dest_addr y. In case the issue persists, other localid-types can be configured in FortiGate should the remote peer be expecting a different local ID type from FortiGate. The FortiOS IPSec VPN uses ESP (Encapsulating Security Payload) pro Sep 5, 2013 · Nominate a Forum Post for Knowledge Article Creation. However, the remote ID on Fortigate config is called peer ID. Feb 18, 2021 · how to troubleshoot basic IPsec tunnel issues and understand how to collect data required by TAC to investigate the VPN issues. Nov 7, 2024 · I can reproduce the TX errors with an SMB transfer (on Windows). Configuring FortiGate logging for L2TP over IPsec. Nominating a forum post submits a request to create a new Knowledge Article based on the forum post topic. But I have no clue how start these. FortiGate VPN IPsec troubleshooting. The process responsible for the negotiating phase-1 and phase-2: 'IKE'. fnsysctl ifconfig <Phase 1 name> RX packets:0 errors:0 dropped:0 overruns:0 frame:0 Apr 17, 2020 · FortiGate. 5. 30" 6 0 a Sep 4, 2014 · I once had the same issue with 2 Fortigates with policy vpns and we had to reboot the Firewalls to have the tunnel working again. He also had to disable dtd on the Fortigate so that the VPN tunnel would become operational. the ESP payload will be Jun 4, 2011 · IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets 1597163320747963100 tz="-0700" logdesc="IPsec ESP" msg="IPsec ESP" action="error" remip=131. Re: esp_error/IPsec ESP/ VPN IPsec Mensaje por Zero » 10 Abr 2013, 22:11 Hola estuve buscando en la web y no lo llegue a encontrar , pero sin embargo lo encontre en el forigate y pase con la descarga. At the beginning of the transfer, it appears there is a negotiation that causes TX errors to increase. You can configure IPsec VPN in an HA environment using the GUI or CLI. Most networking devices will keep UDP sessions for up to 5 minutes. Use the following steps to assist with resolving a VPN tunnel that is not active or passing t IKEv2 IPsec site-to-site VPN to an AWS VPN gateway IPsec VPN to Azure with virtual network gateway IPsec VPN to an Azure with virtual WAN IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets Cisco GRE-over-IPsec VPN. config vpn ipsec phase1-interface edit "TCP_IPSEC" set fortinet-esp enable. Feb 22, 2024 · If anti-replay is disabled on the local IPsec unit but enabled on the peer, the sequence number from the local FortiGate should not enter the replay windows of the IPsec peer, which will discard it. Scope FortiGate. Oct 11, 2010 · Hello all, I am a new to fortigate and I have came into a dead end in my attempts to establish a successful ipsec vpn connection. Aug 13, 2014 · Hi Guys, I have 2 Tunnel IPSec VPN and both have same error, it happens randomly and when it happen seems like there is no traffic stream in the tunnel even the monitoring say that VPN is up. Select the Log location 网络拓扑. ここからは、実際のFortiGateでのIPsec-VPNの設定方法や設定項目の内容について記載していきます。 VPNの設定. May 11, 2023 · I recently changed out a firewall from Sophos to Fortinet at one of our sites. I just noticed in Zabbix I am getting alerts regarding outbound errors. 从Debug显示ike Negotiate IPsec SA Error: ike 0:VPN-to-SH:28:23: no SA proposal chosen，对比incoming proposal和my proposal可以看出IPSEC阶段二（ike Negotiate IPsec SA Error）没有匹配的加密算法。 FGT-BJ # diagnose debug application ike -1 FGT-BJ # diagnose debug enable ike 0: comes 200. Here, I started with txe=0, download an iso from on computer to another one (trough IPSec VPN) This would force the FortiGate to use TCP as the transport when sending/receiving the IKE packets for this tunnel. IPsec VPN을 맺을 네트워크가 동일한 subnet을 사용 하는 경우; HA에서 펌웨어 업그레이드 또는 리부팅 한 경우 IPsec Tunnel down 현상 Jul 10, 2020 · I would do the following 1> do you have plos ( packet lost ) and if its greater than 2% 2> is the IPSEC ESP data high at that the time of the outage 3> can you recreate any conditions that cause the problem 4> if "yes", I would seriously run "diag debug application ike -1" dump it into a file and analyze from the fortigate. Maybe would be easier if you can share with us the phase1 and phase2 configuration of the tunnel in question. This would force the FortiGate to use TCP as the transport when sending/receiving the ESP packets for this tunnel. In this scenario, you must assign an IP address to the virtual IPsec VPN interface. AH provides data integrity, data origin authentication, and an optional replay protectio Dec 28, 2024 · I have a S2S IPSec tunnel between an Opnsense (24. In this situation, the IPsec tunnels are up on both IPsec units. Viewing FortiGate logs. Feb 20, 2020 · Hi all, I'm facing a problem with tunnel IPSEC site-to-site. In FortiOS, there are two activities regarding the this implementation: FortiOS checks the local in policy It is not unusual to receive IPsec connection attempts or malicious IKE packets from all over the internet. Usually the timers doesn't match so one endpoint decides the negotiated tunnel has expired and tries to negotiate a new one, while on the other endpoint the tunnel has not yet expired so it refuses to negotiate up a new one. 11) -> 60E (6. FortiClient側のVPN詳細設定にて、フェーズ1およびフェーズ2のIKEプロポーザルを AESxxx から DES に変更すると、VPN通信が確立できるようになります。 This is normal, and even mentioned in Fortinets own documentation. Mar 8, 2015 · We have Fortigate 100D. Solution: The Security Parameter Index (SPI) is a value that is sent with every ESP packet and is used as a means of matching incoming ESP packets to the correct IPsec tunnel on the VPN endpoint. I always get this E-Mail's: Message meets Alert condition date=2020-01-06 time=06:09:26 devname= 墙配置是正常的，而只是ESP 报文在互联网上传输异常，也就是说运营商转发 ESP 报文的时候存在异常，或者运营商干脆就直接丢弃了ESP 报文，这样的话 IPsec VPN隧道看上去是好的，但是实际上业务却无法通信的这种情况。不适用 于IPsec VPN的其他故障环境下。 Dec 7, 2013 · On the diagram Installed SAs tab you will notice a source IP address x. The IKE port must match the one configured in the FortiClient, in this case, 443. 615891 VPN-to-SH in 192. These two errors appear only with the same 2 IPSec tunnels. y. end . Teorie se zaměřuje na jednotlivé termíny a bodový popis. Sep 17, 2014 · Foro NO OFICIAL de soporte en castellano de productos de Fortinet: Fortigate, Forticlient, Fortianalyzer, Fortimail, Fortibridge, Fortiguard, Apr 6, 2009 · Nominate a Forum Post for Knowledge Article Creation. 168. ch Aug 24, 2009 · In VPN IPSec environments the event log message "Invalid ESP packet detected" will only appear on the receiving end of the tunnel when the FortiGate receives an encrypted packet from the remote peer. Please provide the template file on LX40 with me. If you don't have any IPsec existing on the FGT, you can try blocking "ESP" with the local-in-policy that might stop the log. Jul 17, 2012 · Nominate a Forum Post for Knowledge Article Creation. Solution Prior to Forti OS 7. The customer uses a checkpoint firewall. If your using rfc1918 address for the tunnel end-points, than NAT-T is an issue. The tunnel on the Fortigate is showing as up and connected. 30, während die Fortinet Firewall eine FortiWiFi 90D mit Version 5. The logs on both the Fortinet and Palo show errors spi not matching. May 22, 2017 · Nominate a Forum Post for Knowledge Article Creation. From Cli: Aug 28, 2023 · Hello all. When FortiGate receives an ESP packet, it will always verify whether the received packet matches an existing SPI for the IPsec traffic. I have not studied the RFC, the information is from various articles on the internet, mostly from manufacturers (focused on Fortinet). 左のメニューから「VPN」＞IPsecウィザードを選択。 名前 任意の文字列を入力してください。 vdom A (IPSEC endpoint) >> IVL Interface --> IVL interface --> vdom B --> physical interface to ISP Issue happens in vdom B where the ESP packet is seen coming in on the IVL, the firewall policy allows it from IVL to ISP interface, but the packet never shows up on the ISP interface. 62 Sep 1, 2023 · I’m seeing ESP errors in my VPN event log. When an unknown ESP packet is dropped, an event log is generated. xxx. Go to Log & Report > VPN Events. 9 and a pfsense . is the "problem" site i can see TX errors for all the IPSEC tunnel interfaces. I would really appreciate any help. Nestudoval jsem RFC, informace jsou z různých článků na internetu, nejčastěji od výrobců (zaměřeno na Fortinet). Don‘t know yet of the Customer has the Same errors on their Site. Instead, the IPsec engine (IPsec handler) reports and drops received ESP packets. 62 We have a Fortigate 60f cluster running firmware 6. 149. IKEv2 IPsec site-to-site VPN to an AWS VPN gateway IPsec VPN to Azure with virtual network gateway IPsec VPN to an Azure with virtual WAN IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets Cisco GRE-over-IPsec VPN Sep 4, 2024 · %IPSEC-3-REPLAY_ERROR: IPSec SA receives anti-replay error, DP Handle n, src_addr x. Every other day the connection seems to fail, although in the monitor it says up. I am running ADVPN at 30 sites with 61F and 10F and I keep getting alerts about "Received ESP packet with unknown SPI. Select the VPN activity event check box. edit <tunnel interface> set mtu-override enable Jun 8, 2020 · 2) Run the "diag vpn tunnel list” command a few times on both FortiGates when generating traffic that will pass through the tunnel. I have been looking a lot but no solution so far. config vpn ipsec phase2-interface Sep 25, 2018 · Nominate a Forum Post for Knowledge Article Creation. Sep 24, 2024 · FortiGateのエラーコードは多岐にわたるため、エラーが発生した場合にはログや診断コマンドを活用し、的確に原因を特定することが重要です。 以上、FortiGateのエラーコードの一覧についてでした。 IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets 1597163320747963100 tz="-0700" logdesc="IPsec ESP" msg="IPsec ESP" action="error" remip=131. Debug shows: ike 0:XXX: invalid ESP 6 (payload not a multiple of block size) SPI c1acad49 seq 0000002d 36 1 xxx. Feb 3, 2025 · FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. Jan 7, 2022 · config firewall policy edit 27 set name "WIN-IPsec to Internet" set uuid ac74e9cc-6fed-51ec-7ad2-0df13b167bbe set srcintf "vsw. Nov 20, 2019 · By Manny Fernandez Lets start with a little primer on IPSec. Select Event Log. but suddenly ipsec tunnels stop passing traffic and ipsec client users were Apr 20, 2020 · はじめに Fortigateで IPsec VPNを利用している場合のトラブルシューティングについて、メーカーの Knowledge Baseや Handbookなどから情報を集めまとめてみました。 参考URLについては、記事末尾にリンクを貼ってます。 情報収集 トラブルシューティングを行う前に、以下の情報を確認しておきます。 VPN Mar 1, 2022 · Hello Tomka, Thank you for posting to Fortinet Community Forums. Primárně se článek zaměřuje na Site to Site VPN s využitím IKEv2 (a ESP). Fortinet solution is to always enable DPD. You can set local-in policies to deny all esp and ike packets from anything you didn't make an exception for. IPsec site to site tunnels were working fine. I captured a log trace (no debug) on the OpnSense side, see below. Jun 29, 2018 · Not sure if I should put this here or general networking. 抓包查看数据是否通过IPSEC接口转发 # diagnose sniffer packet any icmp 4 interfaces=[any] filters=[icmp] 2. Don‘t really know what exactly the customer has there. Alert email can be configured to report L2TP errors. Jul 19, 2019 · L2TP logging must be enabled to record L2TP events. 隧道UP了，但是业务不通，如何排查. My guess is mismatching ipsec settings, either phase1 or phase2. IKEv2 IPsec site-to-site VPN to an AWS VPN gateway IPsec VPN to Azure with virtual network gateway IPsec VPN to an Azure with virtual WAN IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets Cisco GRE-over-IPsec VPN Oct 29, 2019 · FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. conf but again it makes no difference. With this enabled, the packet capture will only show one-way ESP traffic. Aug 31, 2023 · config vpn ipsec phase1-interface edit " tunnelname" set localid-type keyid set localid <(WAN-PUBLIC-IP> end . Our company has a new Fortigate firewall. Go to Log & Report > Log Settings. " about 10 a day. Scope FortiGate 7. Malicious parties use these probes to try to establish an IPsec tunnel in order to gain access to your private network. Note: The replay detection is based on the assumption that the IPsec Security Association (SA) exists between only two peers. Those errors are shown on our Site. When the FortiGate detects an invalid IPsec connection attempt, the IKE daemon drops the unknown ESP packet based on SPI. 50 is the client's remote Fortigate IPsec server, and x. boll. 10: icmp: echo request 2. 1. Oct 28, 2024 · When incoming IPsec traffic is received on FortiGate with sequence number already received, this packet is marked a duplicate and dropped. however its possible to see same esp seq no once esp seq 32 bits been utilized and start again from 1. x. Group Encrypted Transport VPN (GETVPN) uses a single IPsec SA between many peers. To verify Internet traffic is forwarded to FortiSASE: In the FortiGate CLI, check the Public/WAN IP address: Feb 6, 2008 · Okay this did solve the problem. As per your query, yes, you can set the remote ID on the IPSEC configuration on your Forti device. Apr 14, 2021 · Pokusil jsem se dát dohromady stručný popis fungování IPsec protokolu pro navazování VPN. WAN1 is connected to a fiber operator with PPPoe enabled. Establishing a connection is working but after some time (Phase 2 rekeying?) the tunnel sometimes breaks and comes back way later without any action on both sides. FortiGateの設定. 62 Feb 22, 2024 · If anti-replay is disabled on the local IPsec unit but enabled on the peer, the sequence number from the local FortiGate should not enter the replay windows of the IPsec peer, which will discard it. I am going to describe some concepts of IPSec VPNs. 10. Solution It is possible that the FortiGate receives illegitimate ESP traffic and the Fort I’m also experiencing a similar issue with an IKEv2 IPSec tunnel between a Fortigate (7. xxx > yyy. 615008 port5 in 192. 基础网络配置（略）。 FW1的IPSec配置，静态模式的IPSec IKEv2连接，中间没有NAT穿越。 默认配置下IPSec的分片方式为post-encapsulation（后封装），IPSec隧道在收到任何需要ESP封装的报文时，不考虑IPSec Tunnel接口的MTU，先将明文封装到ESP中（如果明文已经是分片包，则会先重组明文分片 Mar 2, 2020 · What happens with the observed log is that FortiGate is not checking incoming ESP packets against the local-in policies. Apr 14, 2015 · I manage both of the devices so can view the logs. Jun 4, 2010 · Disabling ipsec-inbound-cache reduces performance of IPsec VPN sessions terminated by the FortiGate, because without caching an NP6 processor can only run one IPsec engine. 62 Mar 11, 2025 · Set 'fortinet-esp' to 'disable' on the FortiGate side. Mar 21, 2011 · To verify it is necessary to decrypt the ESP packet using Wireshark. this is possible when ipsec sa life is too long and huge volume of traffic. 3 but 0 current bytes. 62 Oct 26, 2022 · 관련글. The user can reduce the MTU in the IPsec VPN tunnel interface in the source FortiGate 192. Fortigate 200D (6. Wie im Internet üblich ist die FortiGate mit einer statischen IP-Adresse versehen (obgleich 1 zu 1 geNATet), während sich die FRITZ!Box hinter einer dynamischen IP verbirgt. When there are over 30 downstream FortiGates in the Security Fabric, the root FortiGate's GUI may experience slowness when loading the Fabric Management page, preventing firmware upgrades using the GUI. Solution FortiGate IPsec VPN supports 2 modes: Transport mode. Here, I started with txe=0, download an iso from on computer to another one (trough IPSec VPN) Sep 25, 2018 · From the peer end, outbound traffic is working normally. 10 -> 192. Primarily the article focuses on Site to Site VPN using IKEv2 (and ESP). 1 set Feb 25, 2022 · FWの設定でESPを許可したらIPsecで問題なく通信できるようになりました。 おわりに ESPパケットだけはじかれることから、FWの設定だと気付くのに時間はかからないと思いますが、事前にFWの設定を確認しておくのは大事だなと感じました。 Aug 22, 2014 · Maybe, but you can monitor the diag vpn ike gateway output from the cli. Anti-replay can affect the traffic through the tunnel, which may lead to ESP packets being dropped. Scope: FortiGate, IPsec tunnels. Sep 13, 2019 · This article describes techniques on how to identify and troubleshoot VPN tunnel errors due to large size packets. On the fortigate unit an ipsec connection is configured as interface mode dialup-server, with certificate based authentication. Solution To verify the IPsec VPN tunnel on a branch FortiGate: Go to Dashboard > Network and click the IPsec widget to expand it. If any remote-gateway is using a port that' s 4500/udp for the destination, than NAT-T is involved. 7. Below are all possible localid-types that can be configured in FortiGate : May 7, 2024 · ・使用するFortiGate FortiGate-200E v7. I also found someone with the same problem between a Fortigate and a Cisco. After that, the traffic stabilizes, and no further errors occur. 5 build0304 (GA) FortiClient 7. Dec 27, 2020 · FortiGateにてSite to SiteのIPsecVPNを構築した。 セキュリティのためにFortiGate自身宛のアクセスを制御する Local in PolicyにてIPsec関連通信をIPsec接続相手のみに Aug 23, 2017 · "Invalid ESP packet detected"」というイベントログメッセージは、 FortiGateがリモートピアから暗号化されたパケットを受信したときに トンネルの受信側にのみ表示されます。 パケットは検証をパスできず、復号化できません。 Oct 25, 2023 · the detect-unknown-spi feature in FortiGate. Scope Unknown SPI logs are observed on a Fortigate for IP addresses that are not valid IPSec peers for the FortiGate. Verify the IPsec tunnel that is established with the SD-WAN On-Ramp location. Please ensure your nomination includes a solution within the reply. 6) IPSEc tunnel. e. 4 build1396. yyy . 311 MET: IKEv2-ERROR:Couldn't find matching SA: IKEv2 IPsec site-to-site VPN to an AWS VPN gateway IPsec VPN to Azure with virtual network gateway IPsec VPN to an Azure with virtual WAN IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets Cisco GRE-over-IPsec VPN Feb 22, 2024 · If anti-replay is disabled on the local IPsec unit but enabled on the peer, the sequence number from the local FortiGate should not enter the replay windows of the IPsec peer, which will discard it. 50 trying to communicate with x. When the IPsec SA life is too long or volume of traffic is high, its possible to see same ESP sequence number once ESP sequence number in 32 bits been utilized and start again from 1. FortiSwitch" set dstintf "wan1" set srcaddr "all" set dstaddr "all" set action ipsec set schedule "always" set service "ALL" set fsso disable set vpntunnel "WIN-IPsec_p1" next edit 28 set name "WIN-IPsec to LAN" set uuid aea950b0-6fee-51ec-2e71-63ba80754538 set srcintf Jul 17, 2015 · Labor. 2: 500-> 100. The IPSEC tunnel is up and running with no complaints for about two weeks. To configure IPsec VPN in an HA environment in the GUI: Set up IPsec VPN on HQ1 (the HA cluster): Mar 14, 2025 · This article describes how to resolve a scenario where ESP packets are being allowed by the ISP to the FortiGate, but there is no response back to the remote gateway that initiated this traffic, especially in the case of a VPN client contacting the Dial-up server. Although I am new to FortiOS I would bet that there is a debug command to have a live view / monitor the setup negotiations of IKE phase 1 and IPSec phase 2 connections. This was working fine before and stopped after upgrading the firmware. Jan 13, 2025 · To configure on the FortiGate`s side: Change the transport type to TCP: config vpn ipsec phase1-interface edit "TCP_IPSEC" set transport tcp. Dec 11, 2018 · If anti-replay is enabled, the FortiGate will force a rekey and IPsec negotiation. Cause Details. 2 ist. Feb 15, 2006 · IPsec on FortiGate. If there are several IPsec tunnels configured on the Fortigate, apply the filter precisely and accordingly. Or not, I'm not sure. Jan 28, 2015 · >Invalid ESP packet detected (replayed packet). Below is a sample log: Jun 2, 2016 · IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets 1597163320747963100 tz="-0700" logdesc="IPsec ESP" msg="IPsec ESP" action="error" remip=131. Solution When an IPSec tunnel is configured on an interface (i. 2: 500 Nov 15, 2023 · After some time we see following errors in the fortigate log: Invalid ESP packet detected crypto ipsec transform-set Tunnel-IPSEC esp-aes 256 esp-sha256-hmac May 9, 2025 · FortiGate, any 3rd party IPSEC VPN gateway. y, SPI 0xzzzzzzzz. Root Cause: 'fortinet-esp' is implemented by FortiGate unilaterally and not supported by FortiClient as of the time this article was config vpn ipsec phase1-interface edit "Spoke" set interface "wan1" set ike-version 2 set peertype any set net-device disable set proposal aes128-sha256 aes256-sha256 aes128gcm-prfsha256 aes256gcm-prfsha384 chacha20poly1305-prfsha256 set transport udp-fallback-tcp set fortinet-esp enable set fallback-tcp-threshold 10 set remote-gw 173. 15. I can ping the exchange server with IP and name and access other resources behind the Fortigate except this outlook issue. The tunnel comes up fine and passes traffic without any issue, but during the renegotiation it seems to go offline and needs manual intervention to bring it back up again. Jan 3, 2024 · Based on the logs, there seems to be a config-request (IP assignment request) coming from the Remote VPN device. Debug on Cisco: 000087: *Aug 17 17:04:36. The first is a phase 1 negotiation failure and looks like this in the logs: Date=2018-06-26 time=23:33:33 devname= devid バージョン FortiGate for VMware FortiOS v7. But this is the Info I‘m going to ask the cutomer for as soon as I reach him. 解決策. 10: icmp: echo request #VPN-to-SH是IPSEC接口 2. Here, I started with txe=0, download an iso from on computer to another one (trough IPSec VPN) Feb 9, 2022 · This article describes how to troubleshoot IPsec VPN tunnel errors due to traffic not matching selectors. But unfortunately the IPsec tunnel (between R1 & Fortigate100A) is not functioning properly. After completing the above steps, ESP packets should no longer be dropped by FortiGate. We are having issues with our IPSEC tunnel and are experiencing a lot of retransmissions. 6) and a Linux VM running StrongSWAN. 11. end. 615030 VPN-to-SH out 192. There is also an NP Offload option on the IPSec tunnel phase1 setting. The theory focuses on individual terms and point descriptions. 0238. See the following IPsec troubleshooting examples: See full list on blog. Disabling ipsec-inbound-cache reduces performance of IPsec VPN sessions terminated by the FortiGate, because without caching an NP6 processor can only run one IPsec engine. Phase 1+2 seem to be running, but I do not get any packets from the tunnel. From t Nov 12, 2024 · But in the case of traffic passing through the IPSec tunnel, there will be a time wherein ESP packet capture is needed. The discarded packets will be logged with the following message in the Event Log: 'Invalid ESP packet detected (replayed packet)'. 10: config system interface. Oct 28, 2024 · FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. Select Apply. May 10, 2023 · I recently changed out a firewall from Sophos to Fortinet at one of our sites. 4. yyy. Apr 25, 2025 · FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. After the third time the problem showed up, we deleted the policy vpns and created a route-based tunnel, that solved the problem. Any solution or workaround is IKEv2 IPsec site-to-site VPN to an AWS VPN gateway IPsec VPN to Azure with virtual network gateway IPsec VPN to an Azure with virtual WAN IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets Cisco GRE-over-IPsec VPN DEPLOYMENT GUIDE | IPSEC NIFCLOUD 1. 0. I guess it‘s just a normal DSL line. 10 Nov 29, 2021 · how local-in policies work with ESP packets destined to a local IP on the FortiGate. Solution: IPsec VPN Tunnel interfaces may report increasing errors in the following command outputs. Dec 29, 2023 · Where 192. Fortigate has an IPSec phase 1 bug since forever where an active phase 1 is not renegotiated if a new request comes from the same peer--say the peer suddenly power cycled and didn't notify that the phase 1 is going down. May 23, 2016 · Here's the setup: I have a FortiGate unit on a business network, which has a FortiGate VPN set up. IPSec Primer Authentication Header or AH – The AH protocol provides authentication service only. We thank you for your patience. I double-checked that the dial-up client could reach the Fortigate and successfully pcap´ed. I already checked Phase 2 policies and everything seems to be right. Aug 17, 2021 · Hey all, Right now im trying to establish a site to site IPsec between a Cisco 2900 Router and a FortiGate 40F Firewall. Ofcause, I could deaktivere anti-replay on phase2 and the events would go away. x. Please check the link mentioned below Normal to get Received ESP packet with unknown SPI. Aug 7, 2019 · It's not UDP 500 you configured but IP protocol number 50=ESP packets that the log is saying. In some case, network administrators need to track specific packets that are encrypted and transferred through IPsec VPN tunnels. After running the command fnsysctl ifconfig per interface, the only one that is showing errors is the IPSEC tunnel. I don't see any packetloss when pinging the fiber operator. And then try to make configuration change on primary HA unit in CLI, bring IPsec tunnel interface up and check whether the issue persists. e. Disconnect and reconnect the dial-up IPsec VPN tunnel on FortiClient. I don't do that because DPD has a purpose and it's not to cover for their bugs. I receiving the log "INVALID-SPI" and after this Received ESP packet with unknown SPI. Apr 9, 2020 · Hi, I am new to this forum. Oct 30, 2017 · On some FortiGate units, such as the FortiGate 94D, you cannot ping over the IPsec tunnel without first setting a source-IP. 网络配置. Your FGT is blocking them already anyway because the SPI doesn't match any existing tunnels. The errors I see on the FortiGate side says: Status: negotiate_error, Message: IPSec phase 2 error, Reason: peer SA proposal not match local policy I have gone over the configs until my eyes are ready to bleed, and they are identical. In this example, the VPN name for HQ1 is "to_HQ2", and the VPN name for HQ2 is "to_HQ1". Clear vpn ipsec-sa tunnel clear vpn ike-sa gateway. 2. Having the same anti-replay setting on both the local and peer IPsec is recommended. Jan 4, 2017 · IPSecは苦手です。そうはいっても逃げてばかりもいられないので、頑張ってトラブルシューティングして繋がるようにしていきます。トラブルシューティングに入る前に、基本的な情報をチェックリストに整理す… Apr 17, 2025 · an issue where packet drops on an IPsec tunnel interface show the message 'no route to <remote_gateway>, drop' in the debug flow. 902344. I also see a few Invalid ESP packet detected (replayed packet) errors. This can be achieved by disabling the VPN interface on the FortiGate for 5 minutes. apqogojfikyrtwupmjajhghetmzekosbzfjnofwfqxrvzefzsehmo