- Plesk for Linux
Scheduled backup to a remote FTP server failed:
PLESK_ERROR: pmm-ras failed (Error code = 1):
STDOUT: Curl error: Unable to resume an interrupted download: (28) Timeout was reached: Last FTP request: PASS *****: Last FTP response: 421 I can't accept more than 3 connections as the same user: Connection to the FTP server has lost
/var/log/plesk/PMM/pmmcli.log files contain the following error:
CONFIG_TEXT: [type 'exceptions.TypeError'] cannot concatenate 'str' and 'list' objects
TypeError: cannot concatenate 'str' and 'list' objects
[error][module]pmmcli[/module][operation]<type 'exceptions.TypeError'>[/operation][message]cannot concatenate 'str' and 'list' objects at File "/usr/local/psa/admin/sbin/pmmcli", line 6, in <module>
CONFIG_TEXT: INFO: Curl error: (28) Timeout was reached: Last FTP request: PASS *****: Last FTP response: 421 I can't accept more than 3 connections as the same user
This is a Plesk bug #PPPM-8749 that will be fixed in future product updates: FTP server has limit on number of connections and Plesk backup cannot upload the file correctly.
As a workaround, do the following:
- Connect to the server via SSH
- Add the option
ftpForbidReuseConnection = 1
This way the number of used connections during backups creation will be decreased so that a remote FTP server can handle this type of connection.
As an alternative workaround, increase the limit of number of connections on the FTP server side.