I've had this issue for a while now, but when trying to join a friends multiplayer world on PC, the loading screen gets to "Found Server" before getting stuck. It's definitely not the host as other people can join and I've tried basically everything I can think of to fix it, including other supposed fixes posted on the forums, but to no avail. I sent a message to Steam support who said they couldn't do anything as it was a Terraria issue, not a Steam one. If anyone has any ideas, it would be great.