Server help

[Dark$aint]

Ok i used to be able to start up my server like this:

Server Description: XXXXXXX
Message of the day: XXXXXXX
Maximum Clients: 14
Administrator password: XXXXXXX
Server port: *left blank*
Public server: yes
Additional server switches: *left blank*
win service name: *left blank*

But now i keep getting this message whenever i try to start my server.

Master server registration failed: failed pinging server

I need to know how to stop this and get a server up.