Unable to access Fail2ban settings or Install retrieve Plesk license: 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>

  PLESK_ERROR: 502 Bad Gateway

  PLESK_ERROR: Unable to remove subscription. The following error occurs in panel.log:

  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>

  PLESK_ERROR: ERROR findFailure failed to parse timeText

• Unable to login to Plesk UI - page keeps loading.

• No error is shown at Plesk > Tools & Settings > IP Address Banning (Fail2Ban) but the following record can be seen 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>

• Fail2ban service is running on the server even though it's disabled on Tools & Settings > Services Management

  # service fail2ban status
  fail2ban-server (pid 2573) is running...

• 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 Plesk > Tools & Settings > License Management the page loads forever until it fails with:

  PLESK_INFO: 504 Gateway Time-out (nginx)

Cause

Incorrect/Incomplete installation of Fail2ban packages. When Plesk 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 using SSH.

4. Delete all Fail2Ban logs:

   # rm -f /var/log/fail2ban*

5. Reinstall Fail2Ban using Plesk Installer.

Additional Information

How to install Plesk additional components