DMZ to LAN - 3 Leg configuration with NLB

Hi Fellas:

I have two TMG's in a NLB array and I'm trying to connect a published web server from the DMZ to an internal SQL Server on the LAN.

I can connect to the web server externally np.

I can test-ping the web server from either TMG np, however I cannot ping anything from the DMZ web server the other way.  The server is able to connect to Windoze Update np.

I have already added a route to use the gateway of the DMZ (eg:  route add 172.18.0.0 MASK 255.255.255.0 192.168.125.1).

Where have a gone wrong?

Thanks!