Unable to modify FTP user: /usr/sbin/usermod execution failed: usermod: user is currently used by process

Symptoms

• Unable to modify FTP user settings in Plesk:

  PLESK_ERROR: SysUser::update() failed: Unable to execute usermng: usermng: /usr/sbin/usermod execution failed: usermod: user is currently used by process 4758 usermng: Unable to modify user:

• Unable to delete Web user in Plesk or rename a domain:

  PLESK_ERROR: Unable to execute usermng: usermng: /usr/sbin/userdel execution failed: userdel: user is currently used by process 4382 usermng: Unable to delete user:

• PHP-FPM is set as a PHP handler at Plesk > Domains > example.com > PHP Settings.

Cause

Resolution

Until the bug is fixed, use the following workaround:

1. Login to Plesk

2. Go to Domains > example.com > PHP Settings and switch the PHP handler from FPM to any with CGI/FastCGI support.
   
   Note: If only FPM by nginx is present in Domains > example.com > PHP Settings, enable Proxy Mode in Domains > example.com > Apache and Nginx Settings
   
   

3. Modify FTP account settings.

4. Set PHP-FPM handler back in Domains > example.com > PHP Settings

5. If the issue still persists, temporarily  suspend the subscription and try again.