Article ID: 118790, created on Nov 21, 2013, last review on Jun 17, 2016

  • Applies to:
  • Operations Automation
  • Virtuozzo 6.0
  • Virtuozzo containers
  • Virtuozzo hypervisor
  • Virtual Automation

Symptoms

Backup operation fails with error:

Backup operation for node 'test.node.com' failed: Failed to connect to backup server: Can't perform SSL connection: (null)
Backup failed

In POA, VPS backup task fails with the similar error:

422 : Failed to connect to backup server: Can't perform SSL connection: (null)

Cause

The error means that it's impossible to establish connection on port 4434 between the hardware node (node where containers are running) and the backup node.

Possible reasons:

  • Network is misconfigured or malfunctioning
  • PVA installation is corrupted
  • Resource shortage on the source server
  • Server is unable to initialize structures necessary for SSL connection establishment

Resolution

In order to fix this issue we recommend you to follow these troubleshooting steps:

  1. Make sure both hosts can ping each other.

  2. Check if PVA Agent ( VZAgent ) service is up and running on target PVC server, try to restart it.

    Status can be checked using following command:

    For Linux:

    # pvaagent status
    

    For Windows:

    C:\> sc query pvaagent
    

    Restart can be performed using following command:

    For Linux:

    # pvaagent restart
    

    For Windows:

    C:\> net stop pvaagent /Y && net start pvaagent
    
  3. Make sure that ports necessary for PVA communication are open and both hosts can establish connection to these ports. Ports necessary for PVA communication are listed in the following article:

    [9516] - Which ports should be opened on Parallels Virtual Automation (PVA) Slave Nodes and on PVA Management Node?

  4. Check resources usage on the hardware node (the one where containers are running) - node should have free resources.

  5. Make sure that SSL connection is possible:

    Execute the command on the hardware node:

    ~# openssl s_client -connect <BACKUP_SERVER>:4434 -cipher ADH-AES256-SHA
    

Search Words

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Backup failed

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