Can't join friend, loads me into main screen

[sacred gulch]

I've tried to join my friend, it tells me I joined the server on his screen but then that I left, it then puts me back into the main menu. We have the same version, tried both with and without passcodes, tried direct IP. He can join my server, but we were all on his server last night. Before it kicked me into the menu it just crashed my game for a solid 30 minutes instead.

[simple sage]

Good day sir

Possible issues:

1. Something went wrong within network set up

It is quite common that something could go wrong just because your machine or your router worked without rebooting for a long time. Turning it off and on again sometimes can do magic… we don't know why, but before trying other things, try doing the basics:
a. Reboot your PC
b. Shut down Steam and relog
c. Reboot your router
d. Check the game's file integrity

2. Block by your ISP

We are seeing that quite a few ISPs are blocking access to our backend service that help player to connect. We do not understand why this happens yet, but we are trying to reach out to them and try t address this. A few has already replied and unblocked us allowing players to play normally, however this process could take time.

a. If your ISP has any sort of app or a website where you can turn off additional security settings - try doing this, it could help
b. If you know a place where your ISP shows a list of blocked sites - try looking for something that has windrose.support in it - this is us! Please unblock!
c. Try connecting via different connection services (even if you are from NA, if you can not connect with your friends, try selecting Asia or CIS and see if it works for you)
d. We cannot recommend to install any third party software, but quite a few people reported that using apps like https://one.one.one.one/ or similar to this one  could help to bypass this block untill it is lifted by ISPs

3. You network settings priorities IPv6 over IPv4

The game is currently architected to use IPv4, so if your IPv6 priority is much higher there could be connection issues. Disabling IPv6, or increasing IPv4 priority could sole that issue.
https://playwindrose.com/faq/#faq-ipv6