Troubleshoot The RPC Server is Unavailable



On the Services window, scroll down to find the items DCOM Server Process Launcher, Remote Procedure Call (RPC) and RPC Endpoint Mapper. Ensure their status is Running and their startup is set to Automatic

Scroll down to find Remote Assistance. Ensure its communication is enabled (All the boxes of this item are ticked) in firewall advance

Make sure File and Printer Sharing for Microsoft Networks and Internet Protocol Version 6 (TCP/IPv6) are enabled (The boxes next to these items are ticked).

When your Registry Editor is opened, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\RpcSs. See if there is any item that does not exist as the image below shows.

If you found Remote Procedure Call (RPC) 
DCOM Server Process Launcher
RPC Endpoint Mapper was not correctly set when you tried method 1,  you can edit Start registry key in RpcSs path. Double click on Start to edit its value. Set its value data to 2.

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