Unable to create backup to remote FTP storage: Requested data is out of the cached data

Symptoms

• The creation of a backup to remote FTP storage via the Plesk Backup Manager fails with an error that is similar to the following:

  ERR [panel] Unable to create the remote backup: Transport error: Unable to resume an interrupted upload: Requested data is out of the cached data (current cache size: 500 MB, cached data size: 500 MB, required data size: 2326 MB): The connectivity problem: (55) Failed sending data to the peer: Last FTP request: APPE backup_2312292021.zip: Last FTP response: 125 Data connection already open; Transfer starting

Cause

The backup utilities close the FTP connection before the file is uploaded to the remote FTP storage, because the default timeout limit is reached.

Resolution

Increase the timeout limit for file uploading via FTP by following these steps:

1. Log into Plesk

2. Edit the panel.ini file

3. Add the following line (the value is measured in seconds) in the [pmm] section (create the section if necessary):

ftpFileTransferTimeout = 36000