Last Modified: Apr 23, 2026
Affected Product(s):
F5OS F5OS-A, F5OS-C
Opened: Jan 13, 2026 Severity: 3-Major
In rare cases after upgrading to F5OS v1.8.x, the Web GUI (httpd) may fail to start. System logs may show a missing ServerName directive, and the /etc/auth-config/default/f5os.cert file may be missing or zero bytes.
The webUI is completely unavailable. CLI and API access remain functional.
This issue can occur in certain scenarios where the upgrade process fails to properly generate or retain the f5os.cert certificate file, and the authentication-manager does not recover from the missing or empty certificate, resulting in an invalid httpd configuration.
Restart the authentication-mgr and http-server services using the following CLI command: system diagnostics os-utils docker restart node platform service authentication-mgr system diagnostics os-utils docker restart node platform service http-server
None