Cannot set a fixed endpoint for a COM+ application

In the Distributed Component Object Model (DCOM), you use a fixed endpoint (a static port) to listen to client remote procedure calls. However, this functionality is not available to Microsoft COM+ applications. Typically, functionality is used to limit the ports that are opened through a firewall.

You can call the RpcServerUseProtseqEp function to fix the Transmission Control Protocol (TCP) port on which the COM+ application listens for the COM Object Remote Procedure Call (ORPC). However, you cannot specify a particular port for the application to use manually.

Microsoft Windows 2000

To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base: The resolution for this problem is also included in Microsoft COM+ Hotfix Rollup 18.1. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft Windows XP

To resolve this problem, obtain Microsoft Windows XP COM+ Hotfix Rollup Package 9. For more information, click the following article number to view the article in the Microsoft Knowledge Base: Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk. After you install the appropriate COM+ hotfix rollup, follow these steps to add the required registry entry:

1. Obtain the Application ID of the COM+ application from the COM+ catalog. To locate the Application ID, refer to the application properties in COM+ Explorer.
2. Start Registry Editor.
3. Locate and then click the following key in the registry:
   HKEY_CLASSES_ROOT\AppID
4. On the Edit menu, click Add Value, and then add the following registry value:
   Key name: GUID
   Value name: Endpoints
   Data type: REG_MULTI_SZ
   Value data: ncacn_ip_tcp,0,port number
   Notes
   • GUID is the Application ID of the COM+ application that you obtained in step 1.
   • The port number that you specify in Value data must exceed 1024 and must not conflict with well-known ports that other applications on this computer use.
   • You cannot modify the ncacn_ip_tcp,0 part of this key.
5. Quit Registry Editor.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base: For more information about how to install multiple hotfixes with only one reboot, click the following article number to view the article in the Microsoft Knowledge Base: For more information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the following article number to view the article in the Microsoft Knowledge Base: