We are using a Cisco PIX501 in a 30+ user environment with SBS2003.
SBS2003 is the DNS server and the PIX is the DHCP server.
Problem we're having, which started about a week ago, is that when a client computer gets their address through DHCP they cannot ping the internal IP of the PIX and therefore cannot access the internet. The settings they get via the DHCP server are all set ok.
What I've noticed:
If I manually assign the IP address to the comp using the same address I've gotten via DHCP the problem is still there. If I assign a static address that's not the same and quite a bit higher (but still within the DHCP Pool) then I can ping the PIX and get WAN connection fine.
I.E. 192.168.1.68 won't work but 192.168.1.98 will work and the DHCP Pool is 192.168.1.10 - 192.168.1.100.
Any ideas? Nothing inside the PIX looked unusual (logs, firewall settings, etc.)... I did unplug the PIX to reboot as well as refreshed config settings.