Issue Plesk Onyx 17.5.3 Backup FTP Error

[cloudadmin]

Hello,
Problem started after switching to Onyx. This happens only on Onyx, Plesk 12.5 works fine. All use the same ftp server.
Plesk Onyx 17.5.3 CentOS 7
Warning:
Unable to upload the backup to the FTP storage: Unable to resume an interrupted upload. It seems like FTP server deleted the file, when the connection was lost. Try to repeat or perform upload manually: The connectivity problem: (55) Failed sending data to the peer: Last FTP request: STOR backup_ _1803211501.tar: Last FTP response: 125 Data connection already open; Transfer starting

Thanks in advance

 

[hjmaier]

Do you have access to a second FTP-Server? I would try to upload there. You also can try an create an FTP account and upload the backup to your own server - just to test if the Problem appears there too.

 

[cloudadmin]

On the same server, several backups are active and everyone works properly, except for the one, who worked for some time, and suddenly stopped the ftp transfer. This backup is 5GB and it's the smallest backup on the server.