yes first of all, put all the login servers in your eqhost.txt file so you arent affected if one of them goes down. See
www.eqemulator.net/main.php for details. Next if you using the most up-to-date everquest client (IE you patched using the official EQ patcher and you just changed your eqhost.txt file), you will have to play on servers that are 5.3DR2 or higher, the other servers on the list are running old code that will not work with the latest everquest client.