A big reason for lots of posts on this forum and lots of search results from Goggle about Norton DNS problems is because the "SETUP" page has not been updated for the new IP addresses...
Security threats
199.85.126.10
199.85.127.10
Security threats and Pornography
199.85.126.20
199.85.127.20
Security threats, Pornography and "Non-Family Friendly" sites
199.85.126.30
199.85.127.30
FIX THIS PAGE =>> http://setup.nortondns.com
That page says:
"Your computer is not currently using Norton DNS.
For DNS experts, our recursive DNS server IP addresses are 198.153.192.1 and 198.153.194.1."
Thanks,
Mike