KB188299 - IAS Support for Ports Under 1024

Article ID: 188299

Article Last Modified on 10/18/2005

Microsoft Windows NT Server 4.0 Standard Edition
Microsoft Commercial Internet System 2.0
Microsoft Site Server 3.0 Standard Edition

This article was previously published under Q188299

SYMPTOMS

The IAS Remote Authentication Dial-In User Service (RADIUS) server that ships with the Windows NT 4.0 Options Pack (NTOP) and Microsoft Commercial Internet Systems (MCIS) does not support port configurations under 1024 for communication to a Network Access Server (NAS) or other radius client software.

RESOLUTION

Windows NT Server or Workstation 4.0

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

This fix allows the use of ports below 1024. Again, Microsoft recommends that customers do not install this fix, unless they have a specific need to use non-standard ports. Continue to use ports 1812/1813 per RFC 2138/2139 r purposed, (Web, FTP, and so on).

Windows NT Server 4.0, Terminal Server Edition

To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows NT Server version 4.0, Terminal Server Edition Service Pack 6.

MORE INFORMATION

The ability to use non-standard UDP ports was added because of the specification change noted below.

Implementation Note:

This memo documents the RADIUS protocol. There has been some confusion in the assignment of port numbers for this protocol. The early deployment of RADIUS was done using the erroneously chosen port number 1645, which conflicts with the "datametrics" service. The officially assigned port number for RADIUS is 1812.

Keywords: kbfix kbqfe kbprb KB188299