Err Msg: Error Messages Occur When You Attempt to Use Modem

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Article ID: 158114 - View products that this article applies to.
This article was previously published under Q158114
If this article does not describe your hardware-related issue, please see the following Microsoft Web site to view more articles about hardware:
http://support.microsoft.com/default.aspx/w98?sid=460
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SYMPTOMS

When you attempt to use the modem by using Phone Dialer, HyperTerminal, or another 32-bit communications program in Windows, you may receive one of the following error messages:
Another program is using the selected Telephony device. Try again after the other program completes.
The modem is being used by another Dial-Up Networking connection or another program. Disconnect the other connection or close the program, and then try again.
Error 602: The modem is being used by another Dial-Up Networking connection or another program. Disconnect the other connection or close the program, and then try again.
Dial up networking was unable to complete the connection. The modem is being used by another dial up networking connection. Close the other connection and try again.
Error 630 The port is disconnected due to a hardware failure
These error messages may be displayed even if no other communications program is currently using the modem you are attempting to use. Also, the Modemlog.txt file may not be created, even though logging is enabled.

CAUSE

This problem can be caused by any of the following situations:
  • If you are using an internal modem, the resources that the modem is configured to use may not match the resource settings for the serial port that the modem is configured to use in Device Manager.

    Under normal circumstances, Windows is able to determine which resources the modem is using and configure the serial port accordingly. However, if a resource conflict exists between the modem or the serial port that the modem is configured to use and another device installed on your computer, Windows may be unable to determine which resources the modem is using. In addition, this problem can occur if the resource settings for the serial port are modified manually after Windows configures the port, but the modem is not configured to use the same resources.
  • The Unimodem.vxd file is absent or damaged.
  • There is another communication program currently running on the computer.
  • The port for the modem is not closed correctly.

RESOLUTION

To work around this problem, use the appropriate method:
  • Verify that the resources the modem is configured to use match the resource settings for the serial port that the modem is configured to use in Device Manager. For information about how to determine which resources the modem is configured to use, consult the documentation included with the modem, or contact the modem's manufacturer. To determine the resource settings for the serial port that the modem is configured to use, follow these steps:

    1. In Control Panel, double-click System.
    2. Click the Device Manager tab, and then double-click the Ports (COM & LPT) branch to expand it.
    3. Click the serial (communications) port the modem is configured to use, click Properties, and then click the Resources tab.
    To determine which serial port the modem is configured to use, click the modem in Device Manager, click Properties, and then click the Modem tab.

    If the resources that the modem is configured to use do not match the resource settings for the serial port, physically configure the modem to use different resources or modify the resource settings for the serial port in Device Manager. For information about how to configure the modem, consult the documentation included with the modem, or contact the modem's manufacturer.

    If you are unable to resolve the problem by physically configuring the modem to use different resources or by modifying the resource settings for the serial port in Device Manager, refer to the following article in the Microsoft Knowledge Base:
    152064 How to Install an Internal Modem in Windows 95
  • Verify that the Unimodem.vxd file in the Windows\System folder is not absent or damaged. To do so, rename the file (if it exists), and then extract a new copy of the file from your original Windows disks or CD-ROM. The Unimodem.vxd file is located in the Win95_03.cab cabinet file on the Windows 95 CD-ROM or disk 3 and the Win_20.cab cabinet file in Windows Millennium (Me).

    For information about using the Extract tool, type extract at a command prompt, or refer to the following article in the Microsoft Knowledge Base:
    129605 How to Extract Original Compressed Windows Files
    NOTE: In Windows Me, you must extract files in Safe Mode.
  • Quit any running communication programs. To verify there are no communication programs running on the computer, follow these steps:
    1. Press CTRL+ALT+DELETE to open the Close Program dialog box.
    2. Close all communication programs. To close a program, click the program, and then click End Task.
    3. Repeat steps one and two until all unnecessary programs have been closed.
  • Disable the modem in Device Manager, and then re-enable the modem. To do so:
    1. Click Start, point to Settings, click Control Panel, and then double-click System.
    2. On the System Properties dialog box, click the Device Manager tab.
    3. Under the Device Manager tab, double-click Modem.
    4. Click the appropriate modem, and then click Properties.
    5. On the General tab, click Disable in this hardware profile.
    6. Close all windows, and then restart your computer.
    7. After your computer restarts, repeat steps one thru five.
    8. On the Modem Properties dialog box, click the General tab.
    9. Click Enable Device, and then click OK.
    10. Click Start, point to Settings, click Control Panel, and then double-click Modems.
    11. On the Modems Properties dialog box, click the Diagnostics tab.
    12. On the Diagnostics tab, click the appropriate com port, and then click More Information, and the modem information now displays.

REFERENCES

For additional information about troubleshooting serial port and modemproblems in Windows, click the article numbers below to view the articles in the Microsoft Knowledge Base:
124075 TAPI Apps Can't Dial Unless UniModem Is First Listed Provider
130796 Cannot Set Up Internal Modem

Properties

Article ID: 158114 - Last Review: January 19, 2007 - Revision: 2.1
APPLIES TO
  • Microsoft Windows Millennium Edition
  • Microsoft Windows 98 Standard Edition
  • Microsoft Windows 95
Keywords: 
kbenv kberrmsg kbhardware kbprb KB158114

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