Err Msg: RAS Error 633: The Port Is in Use or Not Configured

Article translations Article translations
Article ID: 162807 - View products that this article applies to.
This article was previously published under Q162807
Expand all | Collapse all


When you attempt to dial out using the Remote Access Service (RAS), you may receive the following error message:
RAS Error 633: The port is in use or not configured for Remote Access Dial-Out.
Stopping and restarting the Remote Access Service temporarily resolves the problem.


If Rasdial.exe terminates prematurely, it can leave the port in an indeterminate state. The port disappears from Remote Access Server Manager if it is configured for dial-in.

This problem is not specific to Rasdial.exe. Any program that terminates prematurely without clearing the port state may cause the same problem.


Install the latest Service Pack for Windows NT version 4.0.


Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem has been corrected in the latest U.S. Service Pack for Windows NT version 4.0. For information about obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base:


Article ID: 162807 - Last Review: November 1, 2006 - Revision: 1.1
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition

Give Feedback


Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from