Getting instantly disconnecting when trying to log into the realm

[Diggermon]

Wanted to see what the frostwolf server was like i downloaded it and i got in the first try but i had restarted the game to install some addons and then i couldnt get back in it justs disconnects me as soon as i log in i checked the config notepad file to check for the SET realmlist "logon.warmane.com" it wasnt there so i put it in and still does the same thing can anyone shed some light on this.

fixed: found out that keeping the optimize net work for speed lets me go in turning it off doesnt let me connect

[Valestia]

Something that should be stickied in my opinion. Someone needs to make a list of possible errors and sticky the topic to keep new players informed.