Migration start failed: Unable to open SSH channel: Channel open failure

Created:

2016-11-16 12:52:54 UTC

Modified:

2017-08-08 13:23:16 UTC

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Migration start failed: Unable to open SSH channel: Channel open failure

Applicable to:

  • Plesk for Linux

Symptoms

When trying to use Plesk Migration Manager I get the following error message:

Error: launchpad error (Error code = 2):

== STDERR ====================
Unable to open SSH channel: Channel open failure
==============================

/var/log/secure contains the following:

Feb 16 12:32:12 hostname.tld sshd[5824]: pam_unix(sshd:session): session opened for user root by (uid=0)
Feb 16 12:32:13 hostname.tld sshd[5824]: error: no more sessions
Feb 16 12:32:13 hostname.tld sshd[5824]: Received disconnect from 203.0.113.2: 11: Disconnect

Cause

SSHd ' MaxSessions ' limit reached

Resolution

Edit /etc/ssh/sshd_config and increase MaxSessions value. If you haven't already provided an explicit value for MaxSessions , it will default to 10

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