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Unable to create a Plesk scheduled backup to a remote FTP storage: Curl error: Unable to resume an interrupted download: (28) Timeout was reached

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Ivan Kamnev
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Plesk for Linux kb: bug ABT: Group B

Applicable to:

  • Plesk for Linux

Symptoms

  • In an attempt to create a Plesk scheduled backup to a remote FTP server the process fails with the error:

    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

  • The similar or the following error can be found in usr/local/psa/PMM/logs/backup-XX/backup.log file:

    CONFIG_TEXT: Curl error: (21) Quote command returned error: Last FTP request: QUIT Last FTP response: 221 Goodbye [common/plesk-utils/PMM/repository-transport/transport.cpp:1010] virtual void plesk::tRepositoryFtp::Delete(const string&) INFO: pmm-ras finished. Exit code: 126

  • The following errors can be found in /var/log/plesk/PMM/backup-XX/pmmcli.log and /var/log/plesk/PMM/pmmcli.log files:

    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>

Cause

This is a Plesk bug with the ID #PPPM-8749, which will be fixed in the next Plesk update releases.

Resolution

Until the bug will be fixed, apply the following workaround:

  1. Log into Plesk.
  2. Go to Extensions > My Extensions > Panel.ini Editor > Open > Editor.

    Note: in case the Panel.ini Editor extension is missing, install it using this article.

  3. Add the line below under the [pmm] section:

    CONFIG_TEXT: ftpForbidReuseConnection = 1

  4. Scroll down and press the Save button.
Solution using the SSH access

  1. Log into the server via SSH.

  2. Execute the command below to open /usr/local/psa/admin/conf/panel.ini in the vi text editor: 

    # plesk conf panel.ini

  3. Add the line below under the [pmm] section:

    CONFIG_TEXT: ftpForbidReuseConnection = 1

  4. Save the changes.

Comments

1 comment

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  • Avatar
    Georgy Sokolov (Edited )

    Add the line below under the [pmm] section:
    ftpForbidReuseConnection = 1

    Add the following line in the <Global> section of the /etc/proftpd.conf file:
    AllowStoreRestart on

    But the error occurs periodically:
    Unable to create remote backup. Error: Unable to export backup: Transport error: unable to list directory: Curl error: (28) Timeout was reached: Last FTP request: PASS ***** Last FTP response: 331 Password required for ftp_login

    What and where is wrong in the settings?

    After Timeout 30s
    INFO: pmm-ras finished. Exit code: 126

    INFO: pmm-ras finished. Exit code: 0

     

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