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Article ID: 124115, created on Dec 31, 2014, last review on Jul 14, 2018

  • Applies to:
  • Operations Automation 5.5
  • Operations Automation 5.4


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, but it did not help. What is the reason of the failure?


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.


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:

Please pay special attention to this section:

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