Plesk backup to remote FTP fails: Unable to resume an interrupted upload: (28) Timeout was reached

Symptoms

Plesk backup to remote FTP fails:

Unable to create remote backup. Error: Unable to export backup: Curl error: Unable to resume an interrupted upload: (28) Timeout was reached: Last FTP request: STOR backup_2006270416.tar: Last FTP response: 200 Type set to I: Connection to the FTP server has lost

Cause

Insufficient FTP timeout settings.

Resolution

1. Log in to Plesk
2. Install panel.ini Editor extension
3. Edit panel.ini using the extension - add the following parameters to it:

   [pmm]
   ftpResponseTimeout=240
   ftpConnectionTimeout=240
   ftpRequestTimeout=240