@Pras71 Wire guard works with dyndns for sure. I did it a week ago with duckdns. But I don't know if your router supports it. ER706W does for sure.

@MR.S I saw that message in logs as well. But didn't know how to overcome it. Good to know, thanks! Guess OpenVPN creators won't be willing to change their approach so we have to wait for TP-LINK. Is...

@MR.S My question now is. Shall we wait for move from TP-Link? Or OpenVPN (mobile app creator)?

Found the culprit! It's newest OpenVPN mobile app's update on Android (3.4.0)! After installing previous version (3.3.4) from old APK file, the connection works perfect.

@MR.S @infinitytec @Pras71 I confirm, on 3.3.4 works like a charm! Looks like newest Android app update (3.4.0) is an issue! OMFG, I've waisted for that like a 4 whole days and bunch of already done...

@infinitytec I use the same app. I didn't have any update for router recently, but it's true that my mobile VPN app got updated... I'll try to find some APK file with previous version of that app,...