Misleading Error 692 with RAS if HyperTerminal Owns COM Port

If you invoke a Dial-Up Networking connection on a COM port that HyperTerminal already has open, or if you try to open a HyperTerminal session by dialing through a port already in use by Dial-Up Networking in Windows NT 4.0, you get uninformative and misleading error messages.

If HyperTerminal already opened an active session on a serial (COM) port and you attempt to open a Dial-Up Networking (DUN) session on the same port, you get the following error message in the Windows NT 4.0 graphical interface (GUI): If Dial-Up Networking has already opened an active communications session on a given COM port, when you attempt to open a HyperTerminal session on that same port you will simply see the word(s):

Disconnected

-or-

No Dialtone

in the HyperTerminal interface.

Microsoft has confirmed this to be a problem in Windows NT version 4.0. We are researching this problem and will post new information in the Microsoft Knowledge Base as it becomes available.

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