This article was previously published under Q314485
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When you attempt to connect to a Microsoft Windows NT 4.0 or Microsoft Windows 2000-based Routing and Remote Access server through a dial-up or virtual private network (VPN) connection, you may receive one of the following error messages:
Error 619, "The port was disconnected."
Error 645, "Dial-Up Networking could not complete the connection to the server."
This behavior can occur if the Routing and Remote Access server is joined to a Windows 2000 domain. If the Routing and Remote Access server is not properly added to the Active Directory, client connections are not possible.
To resolve this issue, register the Routing and Remote Access server in Active Directory.
For additional information about Routing and Remote Access in Active Directory, click the following article number to view the article in the Microsoft Knowledge Base:
227747 Routing and Remote Access Server Stops Authenticating Dial-Up Networking Clients