I have had an issue with a customer running a relatively fresh install of SBS 2011 with all updates. They are finding surfing the internet from local machines incredibly slow. We assumed that the internet speed was to blame as the business estate they are on is slow, however having in the last week updated them to 80MB business Fibre the situation has not improved.
I have checked the DNS on the server. When changing Forwarders it seem to take an age to resolve and establish a connection. I have tried it on the suppliers DNS, Google and OpenDNS. If I run a simple and recursive query it Fails.
I have cleaned dns cache, purged dns and restarted. Still poor.
Any help would be much appreciated