Here are some VERY common errors that people make when trying to launch their server. This also includes other people trying to connect to your server.
1.) Make sure you have correctly placed and downloaded the appropriate maps.
2.) Make sure your core is updated and you are the same as the current patch.
3.) Make sure that you have forwarded WoWs port if you have a router.
4.) Make sure you open MySQL.batch, Apache.batch, Logonserver.exe, and World.exe. (Try to follow that order)
5.) Make sure that you have all the necessary files such as a database (a DB), a Core, and an operating system usually Ascent, ArcEmu, or Mangos.
6.) Make sure you have updated your realmlist to your ip or your redirecting ip. (ex. jadesrealm.ath.cx <-- lol thats mine )
7.) Finally, make sure that your Domain Host is still active. Sometimes they auto delete you if you do not connect for 30 days.
If there are any questions or complaints, please post below. And also i hope this helps.