How to fix 'RPC server is unavailable' error

If you are a Windows user, you probably have the "RPC server is unavailable" error. RPC errors occur when there are problems exchanging between two or more machines through the network, this is a common error in Windows. Before resolving the cause of the error and how to fix RPC server is unavailable, we first need to know about RPC.

What is RPC?

RPC stands for Remote Procedure Call, which uses data exchange technology between Windows processes in a network. RPC works on the exchange model between client and server, in which the client and the server are not always different machines. RPC can also be used to establish communication between different processes on a single machine.

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RPC is a type of request-response protocol, which can be easily explained using the client / server communication model. The process of calling a request is called a "client" and the response to this request is called "server". Note, the client or server may be different devices in a network system or may be different processes within the same system.

In RPC, a procedure call is initiated by a client system, encrypted and then sent to the server. Then the server decrypts the call and sends a response to the client. RPC plays an important role in remote device management over the network and is used to share access to peripheral devices such as printers and scanners. Windows processes related to distributing and sharing data over the network often use RPC technology. Therefore, Windows users often face the problem "RPC server unavailable". However, remote calls are interrupted during execution and therefore difficult to track.

The cause of the RPC error

File and printer sharing is disabled

This is the most common cause of RPC errors. When an external device such as a printer makes a procedure call or request, the device must be enabled for RPC and must be connected to the network to the client to operate. If a problem occurs here, RPC will stop working.

Network connection issues

Because the remote procedure call depends on the network to work, the network connection that has a problem may result in an unavailable server error. Therefore, the client cannot send procedure calls to the server that leads to the "RPC server unavailable" error.

Issues with n ame resolution (name resolution)

When the client makes a request and sends it to the server using the name, IP address and port address. If the RPC server name is mapped to a wrong IP address, it will cause the client to contact the server incorrectly and may lead to an RPC error.

Firewall

Third-party firewalls or any other security application running on the server or on the client, can sometimes block traffic to the server on its TCP ports, resulting in an RPC interruption. .

Registry crash

RPC depends on a valid Windows registry to operate. If any of these items are changed or corrupted, the RPC service will stop working.

How to fix RPC errors

Firewall monitoring

As mentioned earlier, firewalls or security-related applications running on the system can block traffic from RPC requests. If you have a third-party firewall installed, try configuring it to allow incoming and outgoing connections for RPC and other applications intended to be used in RPC. If you cannot configure the firewall, try turning it off for a while until RPC successfully executes.

Step 1: Log in to the system with admin rights.

Step 2: Click Start and access " Control Panel " (For Windows 8 or higher directly search Control Panel from Windows search)

Step 3: In the Control Panel window, click " System and Security" .

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Step 4: Click " Allow an app through Windows firewall " in the " Windows Firewall " option from the menu displayed.

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Step 5: In the Allowed apps window, select Remote Assistance.

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Check Internet connection and its protocols

RPC works based on the client / server model, depending on the network. RPC errors often occur when the connection between the client and the server is interrupted. When encountering this error, ensure that all systems are properly connected in the network. You can also use the "ping" command to check client and server connections. In addition, you should make sure the drivers are installed correctly although network drivers usually do not cause RPC errors, but they should be checked.

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Step 1: Log in to the system with admin rights and hover over the Start menu.

Step 2: Press the Windows + R key on the keyboard at the same time to open the Run window and type " ncpa.cpl " into the box, then click OK .

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Step 3: Select the connection, then right-click it and select Properties .

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Step 4: From the menu displayed, be sure to turn on " Internet Protocols " and " File and Printer Sharing for Microsoft Networks ". If any of these items are missing in the properties, you need to reinstall them.

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Check RPC service

Some services related to RPC run in the background of the server and the server. The steps below will help you check the exact services that RPC needs to operate.

Step 1: Log in to the system with admin rights.

Step 2: Press the Windows + R key on the keyboard at the same time, to open the Run window and type "services.msc" into the box, then click OK .

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Step 3: The service window opens, checking the required RPC services.

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Step 4: If you see any required services that are inactive or not enabled, double-click the service to open its properties window.

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Step 5: On the General tab of the properties window, select " Startup type " to Automatic and start the service.

In this way, you can ensure all RPC services work well.

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Check the system registry

As mentioned above, valid Windows Registry must be available in the system for RPC to work. If any registry entries are corrupted or modified, RPC will not work. When editing the registry, users should be careful, not edit or delete any registry entries before setting up a system restore point, so you can return to the old registry if problems occur.

After creating a restore point, follow these steps to check the RPC registry entry.

Step 1: Click the Start menu and select Run

Step 2: In the Run window, type "regedit" and click OK.

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Step 3: Now navigate to the "RpcSs" path (s) corresponding to your Windows version.

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If any registry entries are found missing in the path (s), consider reinstalling Windows or using third-party tools to repair corrupted or invalid registry.

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If you do not want to find errors and fix RPC errors manually, there are some automatic options to fix these errors. There are many third-party applications and tools that can clean and repair all registry entries in the system and clean up all the old entries in the registry to improve system performance like SpeedyPC and Reimage.

Almost all RPC errors are caused by one or more of the above reasons. If the above still cannot fix the RPC error, try updating the Windows operating system because most problems include corrupted registry, network settings, permissions, and the file system is restored by default after Windows update.

I wish you all success!

See more:

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