RPC Server Unavailable

The most common way we have found that helps resolve a lot of these issues is to run the command "winrm quickconfig" from the command prompt of the server being managed.  If this does not work then follow these more advanced steps from the Microsoft KB:
 
https://social.technet.microsoft.com/wiki/contents/articles/4494.windows-server-troubleshooting-the-rpc-server-is-unavailable.aspx
 
 
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