Parallels Plesk Automation (PPA) fails to register a new Service Node:
SSH communication error: Destination Host (18.104.22.168) unreachable.
or a failed task can be found in PPA Task Manager:
Failed to install RPMS to host 'Service\_Node\_IP\_Address', /bin/env LANG=C /bin/rpm -U --nodeps --force http://MN\_IP\_Address/tarballs/CentOS/6/x86\_64/YUM/rpm-python-4.8.0-12.el6.x86\_64.rpm: STDERR: curl: (7) couldn't connect to host
Network connection between PPA Management Node and Service Node is closed. PPA requires several ports to be opened on Management and Service Nodes. The list of required ports can be found in the following article
Make sure that ports required for communication between PPA Management Node and Service Node are opened.
To troubleshoot network connectivity use the following diagnostic utility:
/usr/local/ppa/bin/checkServiceNode --ip <Service_Node_IP_Address>