Symptoms
Task for provisioning Windows services via MPS fail with errors like this:
Provisioning request failed. The RPC server is unavailable.
I have checked MPS in accordance with the article https://kb.cloudblue.com/114182, but it did not help. What is the reason of the failure?
Cause
It can be caused by incorrect firewall configuration: some needed ports are not allowed. For example, ports 135, 445 should be open between MPS <> IIS Web server in both directions.
Resolution
Login to MPS server via RDP and check what port is used by DllHost.exe (you may check it with netstat -b command). Check if this port is allowed between MPS server and correspondent Windows server used for hosting services.
General requirements for firewall configuration in Windows Infrastucture can be found here: http://download.pa.parallels.com/poa/5.5/doc/index.htm?fileName=41301.htm
Please pay special attention to this section: http://download.pa.parallels.com/poa/5.5/doc/58769.htm