We're having continued attacks on the server and queries may well be dropped by the firewall from time to time. If you don't get a response try again in a few seconds. There's nothing that stops you from joiining or spectating. If you can't join there's some other cause which isn't likely to be to do with the game server. You should be able to join pretty much any time.
The server browser favorites show MIA WARFARE as N/A cant join or spec and its 80.4.151.145:7777 but if I use the link here on forum it starts tje 32 bit ut2004.exe but want to use the 64-bit as I always use
