75.75.75.75 Not Resolving

I recently switcht to Comcast from Fios and I have been unable to access the Internet.  I have a domain contoler and a terminal server with 6 thin clients accessing it.  On my DC, I added 75.75.75.75 and 75.75.76.76 as Forwarders but fail to resolve.  Not sure why.  Any thoughts.

I my local network appears to be ok and my VPN is working.  I have a Sonicwall TZ 205.  I also have VOIP phone that go though Comcast ( 5 Static IPs) and they are working.

Its just web sites.  I cannot ping www.google.com for example.