Error 720 while trying to connect to pptp VPN

VPN
1

Hi everyone,
when I try to connect to a network via VPN I get the following error 720:
“Dial-Up networking could not negotiate a compatible set of network protocols you specified in Server Type settings. Check your network configuration in network control panel and try the connection again”

I checked my: firewall rules, secret, ppp interface, profile and they all were good I even tried to connect from another pc on from another connectivity and I was able to connect succesfully.
But going back to the first laptop i still had the same error, I even enabled Chap on the network card but I still get the same error.

The router is a RB951Ui-2HnD v6.18 and both laptops have Windows 10 installed.

I was wondering if any of you had the same problem or new the solution?

Any tip on how to solve this is very welcome

Edit: I noticed that when I check the secret tab of ppp I see the time and date of everytime I tried to connect as “last logged out”, but there is no connection to speak of and it returns the same error mentioned in the post

Solved: Finally I managed to solve the issue, the problem was that was probably related to a Windows update, the WAN Miniport PPTP was unistalled and reinstalled the day before the issue manifested.

2

I noticed that when I check the secret tab of ppp I see the time and date of everytime I tried to connect as “last logged out”, but there is no connection to speak of and it returns the same error mentioned in the post

3

Finally I managed to solve the issue, the problem was that was probably related to a Windows update, the WAN Miniport PPTP was unistalled and reinstalled the day before the issue manifested.

4

Enable PPTP logging on the router, and check what’s the issue.
Also, you should upgrade from 6.18 to at least the long-term 6.46.8

5

Are you using PPTP for any particular reasons? IKEv2 is much better in every way.

6

Already enabled it I’m gonna upgrade asap

7

If you can’t upgrade at once to the latest software, download minor versions in steps of five and upgrade via drag and drop in winbox.

8

Unfortunately my boss want it that way, I tried to hammer home what you said but he is really stubborn

9

You should him that it’s obsolete and has serious security vulnerabilities. I have some scripts that will setup IKEv2 on the router and clients in a few minutes. Windows has a built-in IKEv2 client so there is literally no advantage to using PPTP.