The RPC server is unavailable error means your Windows computer is having a problem with communication with other devices or machines through the network you use. 

If you get this error, don’t worry. Most Windows users are able to resolve it with one of the following solutions. You may not have to try all of these solutions; just work from the top down until you find the one that works for you:

  1. Ensure your RPC services are running properly
  2. Check the firewall on your computer
  3. Check your network connection
  4. Check your Registry

Note: The screens shown below are from Windows 10, but all the fixes also apply to Windows 7.

Method 1: Ensure your RPC services are running properly

The RPC server is unavailable” problem can be caused by improper functioning of RPC service on every computers connected. You may follow the steps below to ensure that all the services related to RPC run normally.

1) Press the Windows logo key and R on your keyboard to open the Run dialog. Then type “services.msc” and press Enter.

2) 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

3) If not, you should go to method 4 to change the related settings in Registry. 

Method 2: Check the firewall on your computer

Firewalls can block traffic requested by RPC and therefore cause RPC server unavailable problem. You should check your firewall configuration and see if it blocks the network connections for RPC. If you are using a third-party firewall, read its instruction or do some research about it to unblock the RPC network connections. 

If you are using Windows Firewall, here are the steps of its configuration:

1) Press the Windows logo key and R on your keyboard to open the Run dialog. Then type “control and press Enter. 

2) On Control Panel, search windows firewall. And then click Allow an app through Windows Firewall below Windows Firewall.

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

Method 3: Check your network connection

The RPC server is unavailable” problem sometimes occurs because your network connection is not set properly. To check your network connection:

1) Press the Windows logo key and R on your keyboard to open the Run dialog. Then type “ncpa.cpl” and press Enter

2) Right click the network connection you are using, and then select Properties.

3) 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).

You can also reset file and printer sharing by reinstalling your network adapter driver. If you’re not comfortable playing with device drivers, we recommend using Driver Easy. It’s a tool that detects, downloads and (if you go Pro) installs any driver updates your computer needs.

You may need another computer that has Internet access so you can install your network driver.

To uninstall your drivers with Driver Easy, just go to Tools > Driver Uninstall. Then select your network adapter and click Uninstall. (This requires the Pro version — you’ll be prompted to upgrade when you click Uninstall.)

When you’ve uninstalled your network adapter driver, you can use Driver Easy to reinstall it. If you’re unable to access the Internet, you can use the Offline Scan feature to install your network driver. It scans and detects your network devices, and you can use the results to download your network drivers on another computer with Internet access.

Method 4: Check your Registry

You should check your Registry settings to make sure RPC is running properly on your computer. To check Registry:

(*WARNING: Registry editing can bring about unexpected problems to your computers. It is strongly recommended that you create a system restore point and back up your registry before you proceed.)

a) Log in your operating system as Administrator (Registry Editing requires Administrator Privileges).

b) Press the Windows logo key and R on your keyboard to open the Run dialog. Then type “regedit and press Enter.

c) 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 there is, it is suggested that you reinstall your Windows.

d) If you found Remote Procedure Call (RPC) 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.

e) Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\DcomLaunch.  See if there is any item missing. If you found DCOM Server Process Launcher was not correctly set, double click on Start registry key to edit its value. Set its value data to 2.

f) Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\RpcEptMapperSee if there is any item missing. If you previously found the setting of RPC Endpoint Mapper was not correct, double click on Start registry key to edit its value. Again, set its value data to 2.

Sometimes it is possible that you have tried all of the methods above, and you still get the “RPC server is unavailable” error. In this case, we suggest that you should restore your system to a recent restore point or reinstall Windows in your computer. You may also contact your device manufacturers for further assistance.

You may also want to read…

How to connect your computer to VPN.

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