Fortigate ipsec esp error Hi, The IPSec Phase2 is going down BECAUSE the DPD fails. Here, I started with txe=0, download an iso from on computer to another one (trough IPSec VPN) Hi , This could be a bandwidth issue. If there is ESP fragmentation, for example: The original direction traffic is fragmented, but the reply traffic is fine. 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 Remote access FortiGate as dialup client FortiGate leverages IPsec VPN to establish secure connectivity with endpoints/devices that support IPsec VPN. Scope Unknown SPI logs are observed on a Fortigate for IP addresses that are not valid IPSec peers for the FortiGate. 7. Here are an information about this limitation. Your FGT is blocking them already anyway because the SPI doesn't match any existing tunnels. Where 192. It was noted in this case that the FortiGate which was upgraded added a new phase2 object , making the phase2 go down. If your using rfc1918 address for the tunnel end-points, than NAT-T is an issue. After that, the traffic stabilizes, and no further errors occur. Process responsible for negotiating phase-1 and phase-2: 'IKE'. This section provides IPsec related diagnose commands. 10. 149. The ESP packet invalid error is due to an encryption key mismatch after a VPN tunnel has been established. The FortiGate uses the HMAC based on the authentication proposal that is chosen in phase 1 or phase 2 of the IPsec configuration. Select Show More and turn on Policy-based IPsec VPN. Solution: The user may complain about increasing errors appearing on the IPsec VPN interface. As an example, ADVPN, OCVPN, etc. Below are all possible localid-types that can be configured in Hello, We have an issue with a vpn connection between our fortigate 1500 5. You can configure IPsec VPN in an HA environment using the GUI or CLI. I can reproduce the TX errors with an SMB transfer (on Windows). The customer uses a checkpoint firewall. 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 . Solution It is possible that the FortiGate receives illegitimate ESP traffic and the Fort Maybe, but you can monitor the diag vpn ike gateway output from the cli. DPD generates keepalive packets at regular interval and wait an answer from the remote peer. hub-fortigate-auto-discovery. I guess it‘s just a normal DSL line. Solution: For Instance: IPsec VPN site to site with the remote peer of 10. Do you guys know what can cause these errors? Last week I checked all of the configuration and If one side is sending corrupt packets, you’ll see HMAC errors or packet authentication errors. Correcting this settings made the packet loss go away and the errors as well. Tunneling is already performed by another protocol. By Manny Fernandez Lets start with a little primer on IPSec. At the beginning of the transfer, it appears there is a negotiation that causes TX errors to increase. Check the latency to any of the internet destinations while you face the pro Hello Tomka, Thank you for posting to Fortinet Community Forums. e. Instead, the IPsec engine (IPsec handler) reports and drops received ESP packets. Solution Below are the commands to take the ike debug on the firewall: di vpn ike log-filter clear di vpn ike log-filter <att name> <att value> diag debug app ike -1diag debug enable Note: Start Following is a step-by-step tutorial for a site-to-site VPN between a Fortinet FortiGate and a Cisco ASA firewall. Virtual Private Network (VPN) technology lets remote users connect to private computer networks to gain access to This article explains the ike debug output in FortiGate. But this is the Info I‘m going to ask the cutomer for as soon as I reach him. The options to configure policy-based IPsec VPN are unavailable. As per your query, yes, you can set the remote ID on the IPSEC configuration on your Forti device. Also you said the issue happens to some After disabling ipsec-hmac, if the traffic flow is working as expected, enable ipsec-hmac and open the TAC ticket with Fortinet. Now under Log & Reports \\ VPN Events I can see IP So in summary, client says phase1 retransmit reaches maximum count, and server doesn' receive from client and says negotiation timeout. ike Negotiate IPsec SA Error: ike 0:TEST:20877815:12518468: no SA proposal chosen It is possible to see the proposals are not matching, causing the phase2 negotiation to fail. 50 trying to communicate with x. I’m seeing ESP errors in my VPN event log. Downing the VPN tunnel on the fortinet does not work. Clear vpn ipsec-sa tunnel clear vpn ike-sa gateway. Ofcause, I could deaktivere anti-replay on phase2 and the events would go away. are used in FortiGate environments. In some case, network administrators need to track specific packets that are encrypted and transferred through IPsec VPN tunnels. hi all, i have setup policy-based VPN to connect my primary site to secondary sites. The reason of this error on FortiGate is that the MAC calculated by FortiGate does not match the one inside the ESP I’m also experiencing a similar issue with an IKEv2 IPSec tunnel between a Fortigate (7. AH provides data integrity, data origin authentication, and an optional replay protectio IPsec related diagnose command. any Blocking unwanted IKE negotiations and ESP packets with a local-in policy. FortiGate leverages IPsec VPN to establish secure connectivity with endpoints/devices that support IPsec VPN. Solution: During the architecture phase, some users/administrators run a dynamic routing protocol in a FortiGate/FortiOS 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. It' s written in the log In fact, some platform, like Checkpoint, doesn' t support DPD. I am showing the screenshots of the GUIs in order to configure the VPN, as well as some CLI show commands. 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 This article provides technical information about the limitations faced when a network solution uses an already existing IPSec tunnel as an underlay for a new/another IPSec tunnel (i. I'm trying to replace existing pfSense firewall with FortiGate. Use the following steps to assist with resolving a VPN tunnel that is not active or passing traffic. 0. As traffic increases, the number of errors increases greatly (about 1000 per hour). 3 but 0 current bytes. fnsysctl ifconfig <Phase 1 name> RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:337 errors:1 dropped:0 overruns:0 FortiGate. 6) and a Linux VM running StrongSWAN. x. However, the remote ID on Fortigate config is called peer ID. 4, ESP packets with unknown SPI values could not matched by the local-in-policies. The VPN tunnel goes down frequently. Here, I started with txe=0, download an iso from on computer to another one (trough IPSec VPN) Please help me figure out why errors appear on the ipsec channel. 30" 6 0 a I’m also experiencing a similar issue with an IKEv2 IPSec tunnel between a Fortigate (7. 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. When an IPSec VPN tunnel is up, but traffic is not able to pass through the tunnel, Wireshark (or an equivalent program) can be used to determine whether 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 During failover in a High Availability FortiGate cluster, sequence numbers are not synchronized between the master and the slave units (depending on the FortiOS versions as The ESP packet invalid error is due to an encryption key mismatch after a VPN tunnel has been established. Daemon IKE summary information list: diagnose vpn ike status connection: 2/50 IKE SA: created 2/51 established 2/9 times 0/13/40 ms IPsec SA: created 1/13 established 1/7 times 0/8/30 ms I actually didn' t tell my ISP that they had it wrong, just that we were getting ESP errors on port 500 and 4500. When FortiGate receives an ESP packet, it will always verify whether the received packet matches an existing SPI for the IPsec traffic. Daemon IKE summary information list: diagnose vpn ike status connection: 2/50 IKE SA: created 2/51 established 2/9 times 0/13/40 ms IPsec SA: created 1/13 established 1/7 times 0/8/30 ms IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets Cisco GRE-over-IPsec VPN Remote access Encapsulate ESP packets within TCP headers Cross-validation for IPsec VPN Resuming sessions for IPsec tunnel IKE version 2 IPsec VPN. Scope FortiGate 7. Each proposal consists of the encryption-hash pair (such as 3des-sha256). It's not UDP 500 you configured but IP protocol number 50=ESP packets that the log is saying. Below is a list of resources that can be used to configure and troubleshoot 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. dialup-cisco-fw. We thank you for your patience. 1 set psksecret ***** next end This article describes how to troubleshoot IPsec VPN tunnel errors due to traffic not matching selectors. Blocking unwanted IKE negotiations and ESP packets with a local-in policy. config vpn ipsec phase1-interface edit " tunnelname" set localid-type address set localid <(WAN-PUBLIC-IP> In case issue still persists, there are other localid-types that can be configured in FortiGate should the remote peer be expecting different local ID type from FortiGate. Nominating a forum post submits a request to create a new Knowledge Article based on the forum post topic. 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 Blocking unwanted IKE negotiations and ESP packets with a local-in policy. ha-sync-esp-seqno under IPsec phase1-interface settings. To view the chosen proposal and the HMAC hash used: Blocking unwanted IKE negotiations and ESP packets with a local-in policy. 4. 73 is a MikroTik based IPsec endpoint. The pre-shared key does not match how local-in policies work with ESP packets destined to a local IP on the FortiGate. Solution Prior to Forti OS 7. Go to System > Feature Visibility. In addition to Patel's suggestion (try using other ISP), you may also try using a stable FCT version, like 7. Integrated. These two errors appear only with the same 2 IPSec Nominate a Forum Post for Knowledge Article Creation. static-fortigate. Solution . 9 and a pfsense . In this example, the VPN name for HQ1 is "to_HQ2", and the VPN name for HQ2 is "to_HQ1". 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. A invalid SPIs are most likely in the phase2 so the IKE debug is not going to help; these are see when a new SPI switchover or one side expires a SA by byte-sent or seconds before the other from my experience Here' s what I would do; monitor the ipsec sa ( FGT ) diag vpn tunnel list name <the tunnel 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 On the diagram Installed SAs tab you will notice a source IP address x. To configure IPsec VPN in an HA environment in the GUI: Set up IPsec VPN on HQ1 (the HA cluster): This article describes how to allow IPsec VPN port 4500,500 and ESP protocol access to specific IP addresses only. Please check the link mentioned below PANOS = PalaAlto Network OS the software that runs the PA. 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). x. If your VPN tunnel goes down often, check the Phase 2 settings and either increase the Keylife value or enable Autokey Keep Alive. 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. My VPN are UP but not packets transit into the tunnel. #Valid ICMP Errors rcvd: 0, #Invalid ICMP Errors rcvd: 0 #pkts no sa (send): 0, #pkts invalid sa (rcv): 0 2 thoughts on “ IPsec 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. A word about NAT devices. Need a help with configuration local-in-policy to blocking IPsec from not known sources. When an IPsec VPN tunnel is up, but traffic is not able to pass My guess is mismatching ipsec settings, either phase1 or phase2. 50 is the client's remote Fortigate IPsec server, and x. 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. 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 VPN IPsec troubleshooting. Dial Up - Cisco IPsec Client. Don‘t really know what exactly the customer has there. spoke Hello all. 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. As FEC re-transmit some packeges, this makes sence to me, as an ESP packet with a sequence number could be re-transmitted. There are two devices between which an ipsec tunnel is configured. When a device with NAT capabilities is located between two VPN peers or a VPN peer and a dialup client, that device must be NAT traversal (NAT-T) compatible for encrypted traffic to pass through the NAT device. DC1-FG3 (dc1) # fnsysctl ifconfig dc2-rtk-rtk Those errors are shown on our Site. All VPN related config was replicated but facing the issue with establishing VPN. Config from the first device. I actually didn' t tell my ISP that they had it wrong, just that we were getting ESP errors on port 500 and 4500. It is not negotiated between IPsec peers, meaning it does not impact the establishment of tunnels. It will be limited to 10. And regarding that esp_error, Fortinet TAC is saying that it is a known bug. Here, I started with txe=0, download an iso from on computer to another one (trough IPSec VPN) the detect-unknown-spi feature in FortiGate. If any remote-gateway is using a port that' s 4500/udp for the destination, than NAT-T is involved. 1. . 2. g diag sniffer packet wan1 " udp and port 45 Nominate a Forum Post for Knowledge Article Creation. 1 which opened IKE port 500, NAT-T port 4500, and protocol ESP to all IPs on the Internet. edit <tunnel interface> set mtu-override enable. Site to Site - FortiGate. Below is a list of resources that can be used to configure and troubleshoot IPsec related diagnose commands. 0 mr1 patch 3 in HA active-active Primary site have 2 wan inteface connected and i have policy-base route to make VPN priority on wan2 The VPN connections comes up reg What happens with the observed log is that FortiGate is not checking incoming ESP packets against the local-in policies. Scope FortiGate, IPsec. The user can reduce the MTU in the IPsec VPN tunnel interface in the source FortiGate 192. 10 is the FortiGate initiates traffic. 11. Example of setup using transport-mode : Hi Karaked, Anti-replay is a local setting for IPsec phase2. Every other day the connection seems to fail, although in the monitor it says up. 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. 1 only. Dead Peer Detection (DPD) always check the availability of Remote peer and if find any problem with the accessibility it will bring down the tunnel once the threshold value reaches. When incoming IPsec traffic is received on FortiGate with sequence number already received, this packet is marked a duplicate and dropped. To configure IPsec VPN in an HA environment in the GUI: Set up IPsec VPN on HQ1 (the HA cluster): And regarding that esp_error, Fortinet TAC is saying that it is a known bug. Don‘t know yet of the Customer has the Same errors on their Site. In FortiOS, there are two activities regarding With caching enabled (the default), a single NP6 processor can run multiple IPsec engines to process IPsec VPN sessions terminated by the FortiGate. These two errors appear only with the same 2 IPSec Due to a limitation in an equipment, I want to know if it is possible to force fortigate to use AH protocol for the tunnel not ESP ? Azure LB not support yet ESP. These two errors appear only with the same 2 IPSec The logs on both the Fortinet and Palo show errors spi not matching. static-cisco. ESP-in-ESP). The FortiGate matches the most secure proposal to negotiate with the peer. They tracked down the packet loss and we reviewed what the port settings needed to be for the physical connection to the ISP' s equipment. FortiGate offers many variations of IPsec VPN to meet the needs of different environments. Hello, Your VPN is configured to use DPD (Dead Peer Dectection). 186. Automated. Scope: FortiGate. I am going to describe some concepts of IPSec VPNs. I have been looking a lot but no solution so far. If still issues, it is possible to the run following command on originating FortiGate using Putty while doing a large file transfer, for example using SMB, enable logging for Putty, and create a FortiCare ticket: Nominate a Forum Post for Knowledge Article Creation. simplified-static-fortigate. 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. Each proposal consists of the encryption-hash pair (such as 3des-sha256 ). You can hop on the fortigates and run diag vpn tunnels to figure out a common VPN Event log seen on the FortiGate that states 'Received ESP packet with unknown SPI' eventtime=1662679761670200983 tz='-0700' logid='0101037131' type='event' 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. The tunnel comes up fine and passes traffic without any I get a whole lot of esp_errors (Invalid ESP packet detected (HMAC validation failed)). 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 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 . 13. The FortiOS IPSec VPN uses ESP (Encapsulating Security Payload) protocol only For example: an IPsec tunnel between FortiGate and FortiAnalyzer in transport-mode. See the following IPsec troubleshooting examples: Understanding VPN related logs; IPsec related diagnose commands Invalid ESP packet detected (HMAC validation failed). Site to Site - FortiGate (SD-WAN). For example: GRE over IPsec, IP-in-IP over IPsec, or L2TP over IPsec. To fix the issue I have been clearing the phase1 and phase2 connections on the Palo. In this situation, the IPsec tunnels are up on both IPsec units. These two errors appear only with the same 2 IPSec tunnels. It is not unusual to receive IPsec connection attempts or malicious IKE packets from all over the internet. Site to Site - Cisco. The second one is configured similarly. The VPN tunnels on both devices will show up but no traffic is passing. In pfSense under Phase 2 section there is an option Protocol - ESP which I can't see in the Fortigate. 10: config system interface. Or not, I'm not sure. 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 Broad. 168. e. Nominate a Forum Post for Knowledge Article Creation. Dialup Up - Cisco Firewall. 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. Dial Up - FortiGate. dialup-fortigate. 5 or 7. Enable or disable Anti-Replay as follows in in IPsec phase2 configuration: # config vpn L2TP and. 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. how to troubleshoot basic IPsec tunnel issues and understand how to collect data required by TAC to investigate the VPN issues. IPSec Primer Authentication Header or AH – The AH protocol provides authentication service only. But After restarting unit, it didn't happened again, though i can still see the errors notification in the logs a about every day. Every sites have 2 fortigate 60B with fortios 4. Hub role in a Hub-and-Spoke auto-discovery VPN. Please ensure your nomination includes a solution within the reply. ngadfh nvpfm tktp hadhd vlg ccqkl eqr gcg gcuo ekum