What did you already tried in order to resolve the issue? Basic things you can try:
- Go to "settings" -> "General" and klick "Default settings". With that you reset all your settings one time. Now only change the name of the server and restart it.
- Reinstall you server completly unter the option "Reinstall" in your webinterface. Change the name afterward in order to be able to see the server.
- Check if you can join other servers with the same map installed
If nothing helps, like ray said, please write or call us to help you out further.