Are you trying to connect to mysql from inside the same SME server with the mysql service or from a remote machine on the LAN?
- if yes, then you should use localhost or 127.0.0.1
- if from a machine on the lan, then you have to activate access to lan, search mysql in the wiki for procedure.
alternatively, if you are trying to reach a mysql instance on a remote machine not running sme, then you need to ooen the mysql port on the firewall of this machine an allow myql to listen on the lan. See ad hoc documentations.