We are running a SonicWALL Pro 2040 Standard with firmware version 18.104.22.168-77s.
I'm running into problems when I try to switch this unit over to a new IP address on a new block (and a new switch) we've been assigned. Essentially, when I change the IP address, subnet mask, and default gateway under Network -> Settings all activity on our network ceases. Even stranger is the fact that the two servers already plugged in to this new switch and operating normally on the new IP address block lose Internet connectivity when the SonicWALL unit is plugged in to the switch.
When I change these settings back to those on our old IP block (and on a different switch), everything returns to normal.
I've plugged my laptop into the same port on the switch and had no problems connecting to the Internet when I use these exact same network settings, and I've verified that there is no IP address conflict on the network.
Restarting and power cycling the SonicWALL unit after moving it to the new switch/IP block does not make a difference.
And I've tried pinging the new default gateway under System -> Diagnostics, and I get a 'timed out' error.
Might there be some security setting or something that I'm missing? The only changes I'm making are the IP address, subnet mask, and default gateway (DNS servers remain the same).