When a Dial-Up Networking (DUN) client connects to a 40-bit or 128-bit Routing and Remote Access Server that is configured to "Require Data Encryption" or "Require Strong Data Encryption", the client is not disconnected if the selected data encryption negotiation fails to converge.

The following error may be logged in Event Viewer in the System Log on the server after the client has successfully established its connection:

   Event ID   : 20073
   Source     : Router
   Description: The following error occurred in the %protocol_name% module
                on port %port_name%. The PPP control protocol for this
                network protocol is not available on the server.
				

NOTE: This error may also be logged after the installation of the Routing and Remote Access Service Hotfix Update 1.0 if "Require Strong Data Encryption" is enabled.

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To resolve this problem, obtain the latest service pack for Windows NT 4.0 or 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:

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Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

Microsoft has confirmed this to be a problem in the Routing and Remote Access Service for Windows NT Server version 4.0.

This problem has been corrected in the RRAS Upgrade for Windows NT Server 4.0 Hotfix Pack 3.0 or later. For your convenience, the English version of this post-SP3 hotfix has been posted to the following Internet location. However, Microsoft recommends that you install Windows NT 4.0 Service Pack 4 to correct this problem.

ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/rras30-fix/ (ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/rras30-fix/)

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For additional information, please see the following articles in the Microsoft Knowledge Base:

ARTICLE-ID: 189594 (http://support.microsoft.com/kb/189594/EN-US/)
TITLE : RRAS Upgrade for WinNT Server 4.0 Hotfix Pack 3.0 Release Notes

ARTICLE-ID: 169895 (http://support.microsoft.com/kb/169895/EN-US/)
TITLE : Enabling 128-bit Encryption for Routing and Remote Access

ARTICLE-ID: 174474 (http://support.microsoft.com/kb/174474/EN-US/)
TITLE : Installing RRAS Disables 128-bit RAS Encryption

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