[HELP] Cannot Connect to game server

So I followed the instructions, i took a 100% working server from localhost and put it on a server. However when I try to connect I see it in the realm list, but when I select it it says.

"Connecting to Game server" for about 2 seconds then I go back to the realm list..

Any ideas?

I am using Honery Wow Ultimate Repack.

If your running a 2.4.2 server with a 2.4.3 client, this may happen

The thing I dont get is why it worked locally but when I move it to the server and change NOTHING except that its no longer local is suddenly cannot work.