Failing to login to GUI with admin account
I'm experiencing a really strange issue with my Virtual F5 LTM. I'm running BIG-IP 11.6.1 Build 1.0.326 and since two weeks I'm not able to log into the GUI anymore. Neither with the admin account, nor with any other account. The CLI is no issue, I can log in there without any problems. I keep seeing the follow logs in de secure.log: Nov 10 21:09:37 localhost alert httpd[20065]: PAM Couldn't open /var/log/pam/tallylog : Permission denied Nov 10 21:09:37 localhost alert httpd[20065]: pam_tally2(httpd:auth): Error opening /var/log/pam/tallylog for update: Permission denied Nov 10 21:09:39 localhost info httpd(pam_audit)[20065]: User=admin tty=(unknown) host=10.128.1.1 failed to login after 1 attempts (start="Thu Nov 10 21:09:37 2016" end="Thu Nov 10 21:09:39 2016"). Nov 10 21:09:39 localhost info httpd(pam_audit)[20065]: 01070417:6: AUDIT - user admin - RAW: httpd(pam_audit): User=admin tty=(unknown) host=10.128.1.1 failed to login after 1 attempts (start="Thu Nov 10 21:09:37 2016" end="Thu Nov 10 21:09:39 2016"). Nov 10 21:09:45 localhost alert httpd[20071]: PAM Couldn't open /var/log/pam/tallylog : Permission denied Nov 10 21:09:45 localhost alert httpd[20071]: pam_tally2(httpd:auth): Error opening /var/log/pam/tallylog for update: Permission denied Nov 10 21:09:47 localhost info httpd(pam_audit)[20071]: User=admin tty=(unknown) host=10.128.1.1 failed to login after 1 attempts (start="Thu Nov 10 21:09:45 2016" end="Thu Nov 10 21:09:47 2016"). Nov 10 21:09:47 localhost info httpd(pam_audit)[20071]: 01070417:6: AUDIT - user admin - RAW: httpd(pam_audit): User=admin tty=(unknown) host=10.128.1.1 failed to login after 1 attempts (start="Thu Nov 10 21:09:45 2016" end="Thu Nov 10 21:09:47 2016"). Not sure if it's related, but I find it strange that PAM couldnt open the tally log. The file is definately there and permissions seems to be correct. Things I've tried so far without result: resetting the admin password to default creating a new user account with admin rights loading default config set full rights to the tallylog file. uploaded the config to iHealth, no really strange things beside a load of failed loging attempts tried different browsers. Maybe someone else has any suggestions what to do next? I'm kinda stuck now... Thanks in advance.