633 - The port is already in use or is not configured for Remote Access dialout
This error can occur if:
The modem is actually in use - make sure you don't have other applications that are using the modem. Applications that can use the modem include fax software, terminal software (like HyperTerminal), as well as voice software including software that can make your modem an answering machine or speakerphone.
One way of seeing all running applications is to press CTRL+ALT+DEL and look at the Task List or Task Manager. This will display the actual program names - it may be difficult to pinpoint which, if any, programs are accessing the modem. Terminating tasks are about the only way - however, if you terminate certain tasks, your system may crash or become unstable.
The telephone.ini file is missing or damaged - If the telephone.ini file is missing or damaged, you can create a new one by running Tapiini.exe - this file is in the \windows\system folder. Before you run this, rename the telephone.ini file and reboot your PC if it already exists. Then, run the tapiini.exe file. This program will run very quickly and may not appear to do anything. You can verify the program created the telephone.ini file by searching for it.
The telephone.ini file is a Microsoft Windows file that stores settings for all TAPI-enabled applications including DUNS.
Make sure the modem named in the DUNS entry matches the name of your installed modem - You can check the name of your modem in ControlPanel->Modems.
Windows 95/98 - Can occur if the Unimodem TAPI file (unimdm.tsp) is missing or damaged. See MS KB Q150619
Windows XP - Can occur if another device's driver has a conflict with the modem driver. MS KB 324760 indicates this can occur with older Palm Desktop HotSynch Software.
634 - Cannot register your computer on the remote network.
642 - One of your NetBIOS names is already registered on the remote network.
This error should not occur with Dial-up networking connecting to an ISP. Make sure that your connectoid does not have the 'Log on to Network' checked.
This error may occur if you are connecting to a remote server - the name you have assigned to your computer (in networking) may already be registered on the network. Check with the network administrator and, if necessary, change the name of your computer in Windows Networking.
Also, make sure your computer is not physically attached to the network you are trying to connect to using remote access services.
635 - Unknown error.
This error can occur if:
The username or password is incorrect, after repeated attempts to enter password.
Depending upon ISP and DUNs setup, you may be prompted to input username and/or password. After repeated attempts, error 635 may occur.
To resolve: make sure your username and password are correct; contact your ISP to make sure your account is still active. Use HyperTerminal to try and log in.
636 - The wrong device is attached to the port.
639 - No asynchronous net available.
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