Zone network issue

Hi guys,

I got a global zone with with two zones runnig.
After a patch upgrade (July 2010) one of them stop to working fine: basically I can't ping it ( I mean I can ping from the other zone, but actually the ping pass across the global zone..) and I can't access it in ssh or telnet...(actually only from the other zone).
The services are running and I've just restarted them, and everything else seems ok...
Any suggestion???