Looking at your vent setup, this is all that's being returned from your server. What host do you use? Some hosts have settings in their config that make querying in such a way impossible.

I use hostventrilo.com and it has always shown before now, so I don't think that the host is the problem. I'll have to doublecheck.

The program that I checked it with is the "ventrilo_status" script provided by Ventrilo. If this isn't returning any further information, then it is indeed a server-side setting. They may have changed config on you (maybe migrating your vent server over to a new one with a different config).

But it's definitely server-side.