Unable to access Fail2ban settings: Timeout of 10 seconds has been reached. Lock 'service.fail2ban' is already owned by another process with pid <unknown>

Symptoms

• While accessing Plesk >Tools & Settings > IP Address Banning (Fail2Ban), one of the following errors appear:

  PLESK_ERROR: Internal error: f2bmng failed: ERROR:f2bmng:Timeout of 10 seconds has been reached. Lock 'service.fail2ban' is already owned by another process with pid <unknown>

  or

  PLESK_ERROR: 502 Bad Gateway

  or

  PLESK_ERROR: ERROR Failure failed to parse timeText

• Unable to remove subscription in Plesk. The following error appears in panel.log:

  CONFIG_TEXT: Internal error: f2bmng failed: ERROR:f2bmng:Timeout of 10 seconds has been reached. Lock 'service.fail2ban' is already owned by another process with pid <unknown>

• If there are no errors shown at Plesk >Tools & Settings > IP Address Banning (Fail2Ban), the following record appears in /var/log/plesk/panel.log:

  CONFIG_TEXT: stderr: ERROR:__main__:Timeout of 10 seconds has been reached. Lock 'service.fail2ban' is already owned by another process with pid <unknown>

• The license is in grace period even though it was updated/renewed correctly on a licensing server side:

  PLESK_WARN: You are currently operating within the grace period of your product license. To update your product license, select the Retrieve Keys option on the License Management page.

• While trying to retrieve/install keys at the page Plesk > Tools & Settings > License Management it does not load and fails with the following error:

  PLESK_ERROR: 504 Gateway Time-out (nginx)

Cause

Corrupted Fail2ban packages. When Plesk backend tries to get the service status for fail2ban, the process hangs and returns a timeout error.

Resolution

1. Log into Plesk

2. Stop Fail2Ban service in Plesk > Tools & Settings > Services Management.

3. Connect to the server via SSH

4. Remove all Fail2Ban logs:

   # rm -f /var/log/fail2ban*

5. Open Plesk UI, go to  Tools & Settings > Updates & upgrades > Add/remove componetns > reinstall Fail2Ban component

Additional Information

How to install Plesk additional components