Fix vpn error 720
1. 1.Locate broken miniports [yellow icon]: Device Manager -> View -> Show hidden devices. I had for example 3 bad miniports: WAN Miniport (IP), WAN Miniport (IPv6) and WAN Miniport (Network Monitor).
2.Regedit -> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4d36e972-e325-11ce-bfc1-08002be10318} -> Export. In the generated .reg file, locate the broken miniports. You will then identify all the subkeys which need to be deleted [for example in my case, subkeys 0039, 0041 and 0042]. Double check that those subkeys has a “DriverDesc” which matches our broken miniports… And delete those subkeys.
3.Go back in Device Manager, and right click on a broken miniport, then “Update Driver Software” -> “Browse my computer” -> “Let me pick driver from a list” -> uncheck “Show compatible hardware” and wait for drivers listing generation… Then pick the first “Microsoft” drivers listed [BlueTooth Personal], and ignore warnings. The broken and undeletable miniport will then become a fake bluetooth card, which you will be able to delete.
4.Repeat point 3 for all broken miniports.
5.And reboot the system. The OS will create again its miniports from scratch.
https://superuser.com/questions/525602/all-created-vpns-result-in-error-720
