Intermittent packet loss in IPSEC VPN tunnel

[Shantilal1998]

Facing intermittent packet loss in IPSEC VPN.

Have checked bandwidth, Firewall Utilization & it was fine. The current version is 6.4.9.

Kindly share any suggestion for resolving the issue.

[cpagare]

You can collect traffic logs and packet captures at the time of the issue, below is the document of IPsec VPN troubleshooting:

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Troubleshooting-IPsec-Site-to-Site-T...

https://docs.fortinet.com/document/fortigate/6.4.4/administration-guide/137844/vpn-ipsec-troubleshoo...

You can also try disabling the offloading in the IPsec tunnel policies and cross-verify the behavior, please refer to the link below for the same:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Disabling-NP-offloading-in-security-policy...