RPC server: what should you do if the RPC server is un­avail­able?

Perhaps you were trying to install some hardware, and during the setup process you got the error message “The RPC server is un­avail­able”. Un­for­tu­nately, this is a fairly common oc­cur­rence, par­tic­u­larly in Windows 10. However, the problem is easy to fix. Before we explain how to resolve the issue, let’s take a look at what the error message actually means, and what con­sequences it has.

The RPC server error is also known by its error code: 0x800706BA. It is a straight­for­ward com­mu­nic­a­tion problem caused by com­plic­a­tions in ex­chan­ging data between two machines in a network or two processes on the same computer. In Windows, for some processes to run correctly, data has to be exchanged between a client and the server. Windows processes and com­pon­ents (clients) com­mu­nic­ate with a server using what’s known as a Remote Procedure Call (RPC). The RPC server usually launches auto­mat­ic­ally when the computer is started up.

To execute a service or process, the client must first ask the server exactly where the service is located. You can imagine RPC com­mu­nic­a­tion to be like checking into a hotel: you (the client) want to check in, so you ask the re­cep­tion­ist (the server) for your room number and key card. If the in­form­a­tion is exchanged suc­cess­fully, you will know where your room is and be able to check in without problems.

If the RPC server does not answer the client, then the requested process cannot be executed. This generates the “RPC server is un­avail­able” error message. The most common causes are problems with the network itself, or the blocking of data traffic by a firewall. If the RPC server does not answer, some programs will no longer open properly and you will no longer be able to install or set up hardware or software.

For­tu­nately, the error can be resolved easily and quickly. You just need to restart the service.

• From the Start menu (Windows symbol) open the Control Panel.
• Select “Ad­min­is­trat­ive Tools” and then “Services”. Al­tern­at­ively, you can enter “Services” in the search bar.
• Find “DCOM Server Process Launcher” in the list and double-click to open it.
• You are now in the con­fig­ur­a­tion menu for the RPC server. Ideally, the “Startup type” should be set to “Automatic” and the “Service status” should show “Running”. If this is not the case, set the “Startup type” to “Automatic” and click the “Start” button under “Service status”. Click “OK” to confirm.
• Now close any programs you have running and restart your computer.

The last step is es­pe­cially important because once you have set the “Startup type” to “Automatic” when the RPC server starts up, the processes that were called up pre­vi­ously will start auto­mat­ic­ally and all of the required con­nec­tions will be es­tab­lished. You should now be able to open programs and install and set up software and hardware without any issues.

To prevent the problem from re­oc­cur­ring, check your firewall settings to see whether RPC data traffic is being blocked. If you use a third-party firewall, check the ap­pro­pri­ate settings. If you use the Windows firewall, open the Control Panel and search for “Windows Firewall”. In the “Remote” tab, under “Remote As­sist­ance”, all of the boxes should be checked.

If this is not the case, check that your computer is actually connected to the network as follows: go into “Network and Internet”, right-click on the network con­nec­tion you are using and select “Prop­er­ties”. Make sure that “File and Printer Sharing for Microsoft Networks” and “Internet Protocol Version 6 (TCP/IPv6)” are both checked.