How To Restrict TCP/IP Ports on Windows 2000 and Windows XP (300083)
The information in this article applies to:
- Microsoft COM+ 1.0, when used with:
- the operating system: Microsoft Windows 2000 SP1
- the operating system: Microsoft Windows 2000 SP2
- the operating system: Microsoft Windows XP
- Microsoft COM+ 1.5, when used with:
- the operating system: Microsoft Windows 2000 SP1
- the operating system: Microsoft Windows 2000 SP2
- the operating system: Microsoft Windows XP
This article was previously published under Q300083 SUMMARY
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).
REFERENCESFor additional information about port range allocation, click the article number below
to view the article in the Microsoft Knowledge Base:
217351 PRB: DCOM Port Range Configuration Problems
For additional information about using Microsoft Distributed Transaction Coordinator with firewalls, click the article number below
to view the article in the Microsoft Knowledge Base:
250367 INFO: Configuring Microsoft Distributed Transaction Coordinator (DTC) to Work Through a Firewall
For more information about using DCOM with firewalls, see the following Microsoft Web site:
Modification Type: | Minor | Last Reviewed: | 7/2/2004 |
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Keywords: | kbhowto kbSysAdmin KB300083 |
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