Error Message

The Microsoft Event Viewer displays the following:

DCOM got error "2147944122" from the computer xxx.xxxxx.org when attempting to activate the server:" {8BC3F05E-D86B-11D0-A075-00C04FB68820}

DCOM cannot activate Windows Management Instrumentation (WMI) because it is blocked by a firewall.

Add a new Inbound Rule for Windows Firewall with Advanced Security that allows the connection for Windows Management Instrumentation (WMI). See your Microsoft documentation for information. 

See the following Microsoft TechNet article for details about how to apply the default firewall rule COM+ Network Access (DCOM In) to permit DCOM connections on TCP port 135:
http://technet.microsoft.com/en-us/library/cc774289(v=WS.10).aspx