Troubleshooting Tip: The GUI unresponsive while loading the logs page or searching log entries after upgrading to v7.6.X

Description

This article describes an issue where an administrator sees the GUI unresponsive while loading the logs page or searching log entries.

Scope

FortiGate; FortiOS 7.6.4, 7.6.5 and 7.6.6.

Solution

When an administrator logs in and loads the log page, the firewall GUI responds very slowly and the CPU spikes high due to httpsd process.

Run the following commands to collect the httpsd debugs:

diag debug reset
diagnose debug console timestamp enable
diagnose debug application httpsd -1
diagnose debug enable

To disable debugs:

diag debug disable

Debugging the httpsd process reports the application query failed message:

2026-04-17 15:06:59 [httpsd 4485 - 1776452819    error] build_utm_app_lookup[108] -- FortiFlow application query (host='52.54.57.222',vd='root') failed (-1)
2026-04-17 15:06:59 [httpsd 4491 - 1776452819    error] build_utm_app_lookup[108] -- FortiFlow application query (host='142.250.72.3',vd='root') failed (-1)
2026-04-17 15:07:01 [httpsd 4485 - 1776452821    error] build_utm_app_lookup[108] -- FortiFlow application query (host='13.227.180.4',vd='root') failed (-1)

To resolve the issue, apply the workaround below:

config log gui-display
set resolve-apps disable
end

Or via GUI: Log & Report -> Log Settings -> Global Settings -> Disable 'Resolve Unknown Applications'.

This issue is mainly reported with low-end models with low memory (<2GB).

The issue is currently under investigation, and a fix is planned for inclusion in the upcoming FortiOS 7.6.7 release.