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.

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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.

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

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