I’ve been using SSTP, OVPN and every other vpn/tunnel that MikroTik supports for well over 10 years. I’ve never had any issues like the one you describe.
First upgrade to the latest version (if not already) and if the problem persists create a supout and send it to support@mikrotik.com
I see the exact same problem with the ovpn and sstp servers on a HEX v3 router (RouterBOARD 750G r3).
This might have something to do with this specific model.
I upgraded the routerboard firmware to 6.42.3 today in the hope of fixing this issue. (routerOS was already on 6.42.3, there do not seem to be any vpn fixes in 6.42.4).
And you provide even less information than the author of the topic. Model, software version…
So if it is also bound to hEX v3 in your case, has any of you three sent an e-mail to support@mikrotik.com with a supout.rif created while the issue exists (the VPN connection is already down and you haven’t restarted the ovpn/sstp server yer) as @Cha0s has suggested?
I haven’t seen this problem since I updated the routerboard firmware to the same version as the running RouterOS version. It was still on the factory firmware (3.41) before that.
Might be worth a try for TS. Can’t reproduce the problem anymore so can’t send a supout
After doing several searches, it turns out that the problem came from the fact that the certificate (server-certificate) was not trusted, I ticked the box Trusted in System → Certificate → server-certificate, and since we have no connection problem.