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Windows DUN/RAS Error Number 720
Windows Vista Solution List
- Make certain your ISP is not experiencing an outage.
- In the properties for the DSL connection, click on the Options tab, click on the "PPP Settings..." button, and uncheck "Enable LCP extensions". Hit Ok, Ok, restart your computer, and try again.
- Did you upgrade to Vista and had a 3rd party PPPoE client installed when you did so? Try uninstalling the PPPoE client and reinstall it if it is required by your ISP to connect, otherwise leave it uninstalled and try connecting using the built-in connection manager.
- TCP/IP may be corrupt, try re-installing TCP/IP.
- Know a solution that is not listed? Please let us know about it by using the information located below.
Windows XP Solution List
- Make certain your ISP is not experiencing an outage.
- In the properties for the DSL connection, click on the Networking tab, click on the "Settings" button, and uncheck "Enable LCP extensions". Hit Ok, Ok, restart your computer, and try again.
- Did you upgrade to XP and had a 3rd party PPPoE client installed when you did so? Try uninstalling the PPPoE client and reinstall it if it is required by your ISP to connect, otherwise leave it uninstalled and try connecting using the built-in connection manager.
- TCP/IP may be corrupt, try re-installing TCP/IP.
- Know a solution that is not listed? Please let us know about it by using the information located below.
Windows 2000 Solution List
- Make certain your ISP is not experiencing an outage.
- In the properties for the DSL connection, click on the Networking tab, click on the "Settings" button, and uncheck "Enable LCP extensions". Hit Ok, Ok, restart your computer, and try again.
- TCP/IP may be corrupt, try re-installing TCP/IP.
- Know a solution that is not listed? Please let us know about it by using the information located below.
Windows ME Solution List
- Make certain your ISP is not experiencing an outage.
- TCP/IP may be corrupt, try re-installing TCP/IP.
- This issue can caused by alternate authentication files being installed and interfering with your PPP connections. Due to this, a registry fix is required, please proceed with caution and make certain those files are not needed for another PPP connection on the user's computer. Close all software (antivirus, anti-spyware, Winpppoverethernet.exe, etc), click Start, click Run, type regedit, click Registry, click Export, and export the registry for backup purposes. After you have backed up the registry open the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\RemoteAccess\Authentication\SMM_Files\PPP\ key. Once open, look for a string value Path. If it does not exist, create it with the value of "rasapi32.dll". If it does exist, set the value to "rasapi32.dll". If you made any changes, close the registry editor and restart the computer.
- This may be due to password control file corruption. Go to Start > Run > type msconfig and press enter. Under the Startup tab uncheck both PCHealth and Statemgr, then rstart the computer. Once the computer is back up, go to Start > Run > type msconfig and press enter. Choose SFC and extract the following files: RASAPI32.DLL , PPPMAC.VXD , RNAUI.DLL , MSVCRT20.DLL one at a time to their default locations. Click back on the Startup tab and recheck both PCHealth and Statemgr. Restart the computer and try the connection again.
- Know a solution that is not listed? Please let us know about it by using the information located below.
Windows 98 Solution List
- Make certain your ISP is not experiencing an outage.
- TCP/IP may be corrupt, try re-installing TCP/IP.
- This issue can caused by alternate authentication files being installed and interfering with your PPP connections. Due to this, a registry fix is required, please proceed with caution and make certain those files are not needed for another PPP connection on the user's computer. Close all software (antivirus, anti-spyware, Winpppoverethernet.exe, etc), click Start, click Run, type regedit, click Registry, click Export, and export the registry for backup purposes. After you have backed up the registry open the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\RemoteAccess\Authentication\SMM_Files\PPP\ key. Once open, look for a string value Path. If it does not exist, create it with the value of "rasapi32.dll". If it does exist, set the value to "rasapi32.dll". If you made any changes, close the registry editor and restart the computer.
- This may be due to password control file corruption. Go to Start > Run > type msconfig and press enter. Choose SFC and extract the following files: RASAPI32.DLL , PPPMAC.VXD , RNAUI.DLL , MSVCRT20.DLL one at a time to their default locations. Restart the computer and try the connection again.
- Know a solution that is not listed? Please let us know about it by using the information located below.
Windows 95 Solution List
- Make certain your ISP is not experiencing an outage.
- TCP/IP may be corrupt, try re-installing TCP/IP.
- This issue can caused by alternate authentication files being installed and interfering with your PPP connections. Due to this, a registry fix is required, please proceed with caution and make certain those files are not needed for another PPP connection on the user's computer. Close all software (antivirus, anti-spyware, Winpppoverethernet.exe, etc), click Start, click Run, type regedit, click Registry, click Export, and export the registry for backup purposes. After you have backed up the registry open the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\RemoteAccess\Authentication\SMM_Files\PPP\ key. Once open, look for a string value Path. If it does not exist, create it with the value of "rasapi32.dll". If it does exist, set the value to "rasapi32.dll". If you made any changes, close the registry editor and restart the computer.
- This may be due to password control file corruption. Make certain you have your Windows CD or CAB files. Make certain you also have the Dial-Up Networking 1.3 or 1.4 Upgrade when doing this so that you can reinstall this upgrade as well. Make certain you have any PPPoE software that is required as you will be reinstalling this as well. Start by removing any dialup/dsl connections, then remove any PPPoE software and Dial-Up Networking Upgrades from the Add/Remove Programs Control Panel. Remove all entries from the Network Control Panel. Uncheck "Communications" under "Windows Setup" in the Add/Remove Programs Control Panel and once Windows is finished removing this restart your computer. Reinstall your Communications components then restart your computer. Install your Dial-Up Networking Upgrade, make certain that your Network Control Panel is setup properly and install any removed PPPoE software, then restart your computer. Setup any connections and try again.
- Know a solution that is not listed? Please let us know about it by using the information located below.
Windows NT Solution List
- Make certain your ISP is not experiencing an outage.
- In your connection settings under the "Server" tab make certain that "Server Type" is set to "PPP: Windows NT, Windows 95, Internet".
- Uncheck "Enable PPP LCP extensions" in the Windows NT connection properties under the "Server" tab.
- Know a solution that is not listed? Please let us know about it by using the information located below.
Submit a Solution
Have a solution that is not listed here? Please let me know about it by e-mailing me at bliedel@modemhelp.net!
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