We got a call from a client who is experiencing issues accessing web pages. They are running a SBS 2008 environment and are frequently presented with "page cannot be displayed" when searching google etc, other times accessing the same site will work fine. We know it's not a connectivity issue as their connection has been up for weeks as we can tell via the routers uptime. The strange thing is that when a user is presented with the error, they are able to ping external sites so I know connectivity is fine. All apears fine server side however we noticed that there were no DNS forwarders configured. We have since added them however have not heard back from the client as it was Friday evening when we made the change.
I was just wondering if the lack of forwarders could cause the issue and if there are any other things I should be checking server side.