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Possible Cause of VPN Error 720:
Some of the Windows users get “Error 720 A Connection to the Remote Computer Could not be Established” while connecting to VPN. It happens due to corrupted Wan mini ports.
How to Solve VPN Error 720 on Windows 10, 8, 8.1 and 7:
It can be fixed by uninstalling/reinstalling mini ports or resetting TCP IP Protocol.
Run Command prompt as Administrator and type the following command then hit enter
netsh int ip reset resetlog.txt
Reboot your system and connect VPN again.
If the problem persists then move on to uninstalling/reinstalling mini ports
Type the following command netsh int ip reset reset.log and hit EnterNow type the following command ipconfig /flushdns and hit Enter
Solution 4: uninstalling/reinstalling mini ports
First, create a restore point:
To create a restore point on Windows 7:
To create a restore point on Windows 8:
Next step: Uninstall the non-working miniports
When doing this, make a note of the miniports that you are removing, you’ll need to know this later when reinstalling.
Removing the Problematic WAN Miniport Driver
So, to remove each non-working miniport, do the following:
Reinstall the miniports
You’ll need to do a few extra steps, as the miniport drivers aren’t meant to be installed by users and are not visible. To avoid editing .inf files (which in a lot of cases are protected and not easily editable), we’ll do it the long way.
Download devcon.exe and extract it on your C: drive root
Go to command prompt, go to the directory C:devconi386 for 32 bit and C:devconia64 for 64bit
For each miniport that you have previously uninstalled, execute the command outlined below. DO NOT run all of them or run the command twice, as that will create a second version of the existing miniport, which can cause problems again.
If running the command Reports driver install failure, don’t pay much attention to it, it usually does. The only problem is when it complains about the inf file missing, or a missing class (in which case you most likely made a typo in the last part of the command).
Just copy the command and past it into the command prompt hit enter.
devcon.exe install c:\Windows\inf\netavpna.inf MS_AgileVpnMiniport
devcon.exe install c:\Windows\inf\netrasa.inf MS_NdisWanIp
devcon.exe install c:\Windows\inf\netrasa.inf MS_NdisWanIpv6
devcon.exe install c:\Windows\inf\netrasa.inf MS_NdisWanBh
devcon.exe install c:\Windows\inf\netrasa.inf MS_L2tpMiniport
devcon.exe install c:\Windows\inf\netrasa.inf MS_PppoeMiniport
devcon.exe install c:\Windows\inf\netrasa.inf MS_PptpMiniport
devcon.exe install c:\Windows\inf\netsstpa.inf MS_SstpMiniport
Once done, reboot. Again
This should resolve your issue. Please use the comment box for your suggestions & feedback. For additional help, please submit a support ticket with errors and screenshots (if possible) or contact our 24/7 live chat.
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