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How To Restrict TCP/IP Ports on Windows 2000 and Windows XP
Article ID: 300083 - View products that this article applies to.
This article was previously published under Q300083
Distributed Component Object Model (DCOM) uses Remote Procedure Call (RPC) dynamic port allocation. By default, RPC dynamic port allocation randomly selects port numbers above 1024. You can control which ports RPC dynamically allocates for incoming communication and then configure your firewall to confine incoming external communication to only those ports and port 135 (the RPC Endpoint Mapper port).
To control RPC dynamic port allocation, follow these steps:
For additional information about port range allocation, click the article number below to view the article in the Microsoft Knowledge Base:
217351For additional information about using Microsoft Distributed Transaction Coordinator with firewalls, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/217351/EN-US/ )PRB: DCOM Port Range Configuration Problems
250367For more information about using DCOM with firewalls, see the following Microsoft Web site:
(http://support.microsoft.com/kb/250367/EN-US/ )INFO: Configuring Microsoft Distributed Transaction Coordinator (DTC) to Work Through a Firewall
Article ID: 300083 - Last Review: July 2, 2004 - Revision: 2.4