Backup to FTP fails in active mode if Plesk firewall uses default settings:
Error: Unable to access to the storage:
Transport error: unable to list directory: Curl error: (28) Timeout was reached: Last FTP request: LIST -a Last FTP response: 200 Type set to A Make sure you have entered the correct storage settings.
You can check them independently with the command: curl -v -P - -u ftpuser ftp://203.0.113.2
"Use passive mode" option in Backup Manager > FTP Storage Settings is disabled
This is an internal issue with ID #PPPM-6170, which is planned to be fixed in future product updates.
As a workaround, use passive mode for FTP connection: Tools and Settings > Backup Manager > FTP Storage Settings