My situation was that was running the remote PowerShell command restart-Computer when I got this error message on the Windows 7 machine: The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)
The Cause of Code 800706BA
The underlying cause of my problem was WMI. I was using PowerShell cmdlets such as get-WmiObject that were trying to access data on another Windows 7 computer. What happened was that the firewall was correctly, blocking the RPC ports 135 and 445. Thus I simply disabled the firewall on the target machine and the command then completed successfully.
Example of PowerShell Script
Restart-Computer -computerName LittleServer
Stop-Computer -computer ExchServer
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