FortiOS 7.4.11 Issue in Transparent Mode on FortiGate 401F
Configuration details
Mode :Transparent Mode
Interface setting: Port x1 (internal), Port x2 (External). All traffic from the inside network passes through port x1 to port x2 to reach the internet.
I upgraded the FortiOS version on a FortiGate 401F from 7.4.9 to 7.4.11. After the upgrade, users were unable to access services properly. Specifically:
-Internal users were unable to access the Internet.
-External users were unable to access the web server located behind the FortiGate.
From initial traffic log analysis, I observed that packets were being sent out to the external network, but no return packets were received.
Due to limited maintenance time and business impact, I rolled back the FortiOS version to 7.4.9. After the rollback, all services returned to normal operation.
Has anyone experienced this issue with FortiOS 7.4.11?
Currently, I have opened a ticket with Fortinet Support, but there has been no update yet.
Thank you.