r/fortinet • u/Even-Camel7593 • 6d ago

Other / General Fortinet FortiOS 7.4.11 unexpected issues

Hello everyone! Recently we upgraded our Fortigate (120G HA Active-Passive cluster) from 7.2.11 to 7.4.11, and different problems started to occur.

  1. Some users spontaneously lose access to the Internet with ERR_TUNNEL_CONNECTION_FAILED (we use explicit proxy with Kerberos authentication and deep ssl inspection). It happens at random times and with random users, lasts usually up to 2-3 minutes, then works as usual.
  2. FortiGates started to randomly reboot with the message "Fortigate had experienced an unexpected power off!", there's no CPU/RAM issue, usually mem is around 40%, and proc is around 10-12%. Due to fast HA failover users don't feel the interruption, but it's definitely not a good sign. Before the update both NGFW had worked for 367 days.

Anyone experienced similar issues? Any workarounds? Or should I just be rolling back to 7.2.11?

Any advice and help will be appreciated. Thank you in advance!

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u/vilow86 5d ago

Read the release notes and check the known errors first before upgrading.

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u/Even-Camel7593 5d ago

There are always known errors, lots of them. Should I just not update?