MD-5 CHAP Authentication Does Not Work with Windows NT 4.0 Service Pack 4

ID: Q225503

The information in this article applies to:

Microsoft Windows NT Workstation version 4.0 SP4
Microsoft Windows NT Server version 4.0 SP4

SYMPTOMS

After you apply Windows NT 4.0 Service Pack 4 to your remote access server computer, CHAP-MD5 authentication cannot be used for incoming dial-up connections. Client computers that attempt to authenticate using CHAP-MD5 can no longer connect to the remote access server.

CAUSE

No valid CHAP challenge was being sent by the RAS computer.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:

http://www.microsoft.com/Windows/ServicePacks/

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. This problem was first corrected in Windows NT 4.0 Service Pack 6.

Additional query words: ras chap router Remote Access Server

Keywords :
Version : winnt:4.0 SP4
Platform : winnt
Issue type : kbbug