NOTICE: Private World of Warcraft servers are a violation of Blizzards terms of service and you may not want to risk trying them (or mentioning them in retail WoW) if you are fond of your Blizzard WoW account(s) and don’t want to get them banned.
Private servers are servers run on third-party technology that has been developed in the open-source community to emulate (pretend to be) World of Warcraft servers.
They are designed so that a normal WoW client (the game installed on your hard drive if you play retail World of Warcraft), can connect to them and they act as a normal Blizzard server would act, (with any modifications and changes particular to the private server that you play on).
All that is required is an installed and working copy of World of Warcraft, and using Notepad or another text editor to change a small file in the World of Warcraft/data/enGB/ (or enUS) folder, called REALMLIST.WTF. Oh, and an account with the private server so that you can log in.
In this example I’m going to be using www.naxpgaming.com. Goto this site and create an account, then find the realmlist.wtf file and make a copy of it. Call this file Realmlist.blizz, and edit the Realmlist.wtf file that you just made a copyvof.
Where before it will say something like:
set realmlist eu.logon.worldofwarcraft.com
set patchlist eu.version.worldofwarcraft.com
set realmlistbn “”
set portal eu
Delete all of this and simply put the line:
set realmlist eu.logon.naxpgaming.com
Save the file and load WoW. You will now be connecting to the NaxP server. (Ignore any news on the left of the login screen as this is still collected from the Blizzard servers automatically). You will be able to log in using the account created on www.naxpgaming.com, and then choose a server suited to your play-style.
When you wish to reconnect to your retail WoW account, close WoW and rename the Realmlist.wtf to Realmlist.naxp and rename Realmlist.blizz to Realmlist.wtf. Reverse the process to connect to retail (Blizzard) WoW again.
Simple as!

