Article ID: 118764, created on Nov 19, 2013, last review on Apr 25, 2014

  • Applies to:
  • Plesk Automation


The task 'Install PA agent on node' failed with the following error:

SSH communication error: can not open SCP channel: Invalid ACK response from remote.


The package 'openssh-clients' is not installed on the service node.

[root@postfix ~]# rpm -qa | grep ssh


Install the package 'openssh-clients' with the following command:

yum install openssh-clients

Afterwards restart the failed task.

Search Words

Cannot add service node

can not open SCP channel

Install PA agent on node

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