Played Arma for a long time now, both 2 and 3, never had this problem until now. Reinstalled Windows on a new SSD and started having this problem. I join the server, select my slot, click Ok and it begins the mission file download and stops usually around 12,000kb-20,000kb.

It randomly works sometimes but once a server updates its mission file and I have to re-download, I go through it all over again. Internet speeds are 120mb/s up and 20mb/s down. The server I usually try to play on I get around 50 ping.

Weird thing to note, everything works fine when I join servers through A3Launcher but anything through the normal in-game server browser gives me this problem.