![]() ![]() ![]() For protection, back up the registry before you modify it so that you can restore it if a problem occurs. Therefore, make sure that you follow these steps carefully. However, serious problems might occur if you modify the registry incorrectly. This section, method, or task contains steps that tell you how to modify the registry. The article also lists RPC server applications, and mentions which RPC server applications can be configured to use custom server ports beyond the capabilities of the RPC runtime. You can find a comprehensive list of server ports that are used in Windows and major Microsoft products in Service overview and network port requirements for Windows. When you specify a port or port range, use ports that are outside the range of commonly used ports. Windows services use the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\Internet subkey for this task. Many Windows server applications that rely on RPC provide options (such as registry keys) to customize the allowed ports. An alternative method is to specify a port number or range of port numbers for EPM to use, and open those ports in the firewall. However, this approach might not be practical, especially if the client and server must communicate through a firewall. Configure how RPC allocates dynamic portsīy default, EPM allocates dynamic ports randomly from the range that's configured for TCP and UDP (based on the implementation of the operating system that's used). The firewall then allows RPC bind operations for that UUID and port. When EPM responds and sends a dynamic port number for that UUID, the firewall also notes the port number. In this scenario, if an RPC request uses port 135 to cross the firewall and contact EPM, the firewall notes the UUID that's associated with the request. Some firewalls also allow UUID filtering. For more information, see Configure how RPC allocates dynamic ports. One approach to managing this scenario is to specify ports or ranges of ports for EPM to use. If a firewall separates the client and the server, the firewall has to allow communication on port 135 and on the dynamic ports that EPM assigns. The EPM allocates dynamic ports (also known as high ports or ephemeral ports) for clients and servers to use. Port: The communication endpoint for client or server application.If the function can't be identified, contact your application vendor. However, a good network analyzer will translate the function for you. Opnum: Identifies a function that the client wants the server to perform. ![]() During troubleshooting, you can use the UUID to track the RPC conversations of a single type of application (among the many types that occur on a single computer at one time). UUID: A well-known GUID that identifies an RPC application.Floors: The layers of contents within a tower that contain specific data, such as ports, IP addresses, and identifiers.Tower: Describes the RPC protocol to enable the client and server to negotiate a connection.Endpoint mapper (EPM): A service that listens on the server and guides client apps to server apps by using port and UUID information.To begin, there are several important terms to understand: This is a common networking error that requires some basic familiarity with the process to successfully troubleshoot. The following image shows an example of an RPC error. You might encounter an "RPC server unavailable" error when you connect to Windows Management Instrumentation (WMI) or Microsoft SQL Server, during a Remote Procedure Call (RPC) session, or when you use various Microsoft Management Console (MMC) snap-ins. ![]()
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