Invalid SRB2Kart trouble - Multiplayer.

Hi, A friend of mine on Discord was having trouble while we were trying to play SRB2Kart.
Another can connect perfectly, but the other cant, and he disabled his anti-virus and firewall, and he still can't connect, he did the master server stuff, and is still having trouble, is there anyway we can fix this?

The first time i entered in online, appeared me an message that showed to activate the online thing, probably your friend choosed "No" and now the game don't let him to go in online now...

LuxisLand said:

The first time i entered in online, appeared me an message that showed to activate the online thing, probably your friend choosed "No" and now the game don't let him to go in online now...

Click to expand...

A thing did show up, but he did click yes and it didn't let him in.

The online stopped working for me aswell, sticking us in a endless "Connecting to Server" message, even though yesterday it was connecting me to our friend's room without any problems. We can enter other rooms on the server list, but we can't enter our friend's for some reason, despite it having a ping on it.

This is getting really infuriating, is there anything we can do?