We need Internet access to wfbs-svc.trendmicro.com to setup Trend Micro Worry-Free Business Security Services.
Internet Explorer works for some sites like Google & Bing but not others like msn.com. I usually have to add the site to Trusted and turn on compatibility. Protected mode is turned off.
Firefox is fickle too working only on some sites.
This is a single server domain and DNS is running on the Server 2012.
I noticed that domain PCs are using the gateway rather than the DC for DNS. Maybe it realizes that the server has issues? Router is running DHCP but set to hand out the DC's ip for DNS.
I can ping sites like msn.com & cisco.com without issues