Arda [08-04-10 14.25] :

> Do you think the firebird service freezes because of this setting?
> Actually when it hangs, my phone rings immediately and I reboot the
> server without waiting for 30 secs :)
>

yes I think
both cps and instances

don't forget that these values apply to all xinetd controled process, not only Firebird

so try something like

instances 300
cps 250 10

> PS: Yesterday and today I didn't do any monitoring on the database and
> it works fine :)

I don't think that monitoring by it self is to blame
I stressed it a lot this week and I did not get any freeze