Reinstall dial up networking

Check that the phone line is connected to the "line" socket on the modem. Check that the cord between the wall socket and the modem works. Can not establish a dial up networking connection. Check that the dial up connection is not using a dial in script. Hardware failure in port or attached device. Check that the modem is turned on and installed correctly. Try restarting the computer. Dial up networking could not negotiate a compatible set of network protocols.

Check that the dial up networking connection does not have a dial in script associated with it. Unable to establish a dial up networking connection - protocol not configured. An essential file is missing. The Connection Manager phone number was not saved correctly. If using the Connection Manager software, re-enter the phone number, by either picking from the address book, or manually typing the number in.

Windows Dial Up Networking Errors Below are a list of common windows dial up networking errors and possible solutions.

Error Your modem is not configured correctly. Error Remove and re-install the modem driver. Error Unable to negotiate modem connection. Error Unable to run dial up networking. Error Treat as error Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs.

For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:.

When you try to create a new Dial-Up Networking connection or open one in the Dial-Up Networking folder, you may not be able to select your modem in the Install New Modem wizard. If you look in Device Manager, you see the currently installed modem with the following device status in the modem's properties:. If you open the Modem tool in Control Panel, and then click More Info on the Diagnostics tab, you do not receive any error messages.

This behavior can occur if one of the TAPI components are damaged or missing, or if a third-party Telephony driver is referenced in the registry and that driver is damaged or incompatible with Windows. To resolve this issue, follow the steps in each method. At the end of each method, test to see if the issue is resolved. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

Use Registry Editor to check the ProviderFilename0 value in the following registry key:. If the value data is not TSPL. In the Named box, type telephon. Double-click the Tapiini. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:. In the Named box, type tapiini. Click OK. Click Apply. Click on Windows Setup.

Click once on Communications and then on Details. Reselect Dial-Up Networking. Windows will now copy files from the cabs. If Setup reports that the file being copied is older than the one on disk and ask that you keep the newer one, select No. We are presuming here that we either have version conflicts or file corruption, and any newer files are probable suspects. When finished, Windows will tell you to restart. Select No. Open up Network Control Panel. Click on Dial-Up Adapter, then Properties.

Click on the tab Advanced. Click OK again.