It was working last week.
When in to re-add server several times but it doesn't take.
Nothing has changed.
Same IP:
73.92.151.161:7757

Any help...

See: My server will not add or shows as down, what should I do?

Still not able to add server.

73.92.151.161:7757

But I see my server on:
https://333networks.com/masterserver

And I can see my server on:
http://www.serverbrowser.com/

I've shut down Firewall and still won't work.

Now, GameTracker says my server is "dead" and it can't scan server.
It's been working for months and now, all of a sudden, it's dead.
Anybody?

As the remainder of UT servers are scanning correctly on Gametracker, you should logically presume that the issue is with your server / environment or some issue with the host provider or ISP.