Symantec Brightmail gateway

dear experts

i have setup 10.1 version of VM appliance symantec brightmail gateway

i followed the standard process where

fqdn name

machine ip

dns

gateway

i didnt give any static route

installion is completed successfully but once i log in in gui insert the license file

as we are using Proxy server TMG i insert the user name password with hostname of proxy server

it is failing the credentails are not valid

i have assuming do i have to confgiure static route on linux machine itself so that it can directly talk to the internet?

or using GUI should work