A client has upgraded their broadband line. Now the users cannot access webpages. IE keeps coming up with a DNS error. Strangely some things work. I can remote to the site via Terminal Services and also via logmein. Also the online backup service is running and uploading fine.
I've tried the following, but with the same connection errors.
Changing the DNS server to include google's 18.104.22.168
Changing DNS server to Open DNS which is working as use it on my laptop at home.
Rebooted server and desktops
Disabled AVG firewall and anti virus
Disabled Windows firewall
Changing back to the old line plus router works fine again. I've phoned new ISP and they've checked their end and all set up fine, also ran through router set up and is as should be.
Any ideas on further checks as it seems very strange.