Microsoft KB Archive/227366

= RAS Error 633 Is Cited When You Use Second ISDN Adapter's Dial-up Networking Connection =

Article ID: 227366

Article Last Modified on 2/22/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows NT 4.0 Service Pack 3
 * Microsoft Windows NT 4.0 Service Pack 4
 * Microsoft Windows NT 4.0 Service Pack 5
 * Microsoft Windows NT 4.0 Service Pack 6
 * Microsoft Windows NT 4.0 Service Pack 6a

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This article was previously published under Q227366



SYMPTOMS
When you configure two Dial-up Networking (DUN) connections, using different Integrated Services Digital Network (ISDN) adapters installed on the same computer, and then attempt to connect to the server, the first connection is successful, but when you click Connect in the second DUN connectoid, the following error message may appear:

RAS Error 633: The port is in use or not configured for Remote Access Dial-Out.

When you check the Remote Access Service (RAS) Monitor on the server, all channels are connected with the same IP address, and only one ISDN adapter is displayed as active.



CAUSE
This behavior occurs because multilink bundles all subsequent DUN connections from one computer into one connection to a server when the same username is used.



STATUS
This behavior is by design.



MORE INFORMATION
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

235610 Overview of Multilink and Bandwidth Allocation Protocol (BAP)

Keywords: kbprb KB227366

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