Facebook
Twitter- Server operating system version
- AlmaLinux 9.5 (Teal Serval) and Centos 7 in ftp server
- Plesk version and microupdate number
- 18.0.68 #2
Hello Plesk Community,
I’m encountering a problem when sending full-server backups from my Plesk panel to a remote FTP server. The transfer always stops at approximately 128.79 GB, with a steady upload speed (~109–110 MB/s), and Plesk logs the following error:
Unable to create the remote backup:
Curl error: Unable to resume an interrupted upload: (55) Failed sending data to the peer
In the /var/log/xferlog, each attempt shows the file marked as “i” (incomplete), and only a few kilobytes are ever retried before Plesk aborts and deletes the partial archive. Example excerpt:
Fri Mar 28 02:34:40 2025 1167 xxxxxxxx 128789846920 /xxxxx/backup_2503272315.tar b _ i r rootftp ftp 0 * i
Fri Mar 28 02:34:44 2025 1 xxxxxxxx 14480 /xxxxxx/backup_2503272315.tar b _ i r rootftp ftp 0 * i
...
In my panel.ini, I’ve set:
streamCacheSize = 1024
ftpMaxResumeAttempts = 10
ftpMaxResumeFailures = 15
ftpFileTransferTimeout = 36000
ftpForbidReuseConnection = 1
backupsValidationPeriod = 0
What I’ve tried so far:
Thanks in advance for any pointers!
Delton
I’m encountering a problem when sending full-server backups from my Plesk panel to a remote FTP server. The transfer always stops at approximately 128.79 GB, with a steady upload speed (~109–110 MB/s), and Plesk logs the following error:
Unable to create the remote backup:
Curl error: Unable to resume an interrupted upload: (55) Failed sending data to the peer
In the /var/log/xferlog, each attempt shows the file marked as “i” (incomplete), and only a few kilobytes are ever retried before Plesk aborts and deletes the partial archive. Example excerpt:
Fri Mar 28 02:34:40 2025 1167 xxxxxxxx 128789846920 /xxxxx/backup_2503272315.tar b _ i r rootftp ftp 0 * i
Fri Mar 28 02:34:44 2025 1 xxxxxxxx 14480 /xxxxxx/backup_2503272315.tar b _ i r rootftp ftp 0 * i
...
In my panel.ini, I’ve set:
streamCacheSize = 1024
ftpMaxResumeAttempts = 10
ftpMaxResumeFailures = 15
ftpFileTransferTimeout = 36000
ftpForbidReuseConnection = 1
backupsValidationPeriod = 0
What I’ve tried so far:
- Adjusted streamCacheSize in panel.ini (currently 1024) to increase buffer, without success.
- Verified network stability—no packet loss or obvious timeouts on my side.
- Confirmed the partial file is always purged by Plesk immediately after the abort.
- Could any of these settings be causing the backup to abort at ~128 GB?
- What quick configuration tweaks or tests can I try—either in Plesk or on the FTP server—to allow the backup to complete?
Thanks in advance for any pointers!
Delton