We have a Small Business Server 2011 implementation with 8 PCs. All of our users could not get on sites like fedex.com or ups.com. Most other sites were fine, but when we browse to UPS or Fedex, it redirects to an obviously spoofed Google page with spammy ads. I change the default DNS settings at the client to point to Google's 22.214.171.124 DNS server and that seemed to fix the problem at the client, but I am worried about the server.
I ran virus scans on the client and server and did not find any viruses. SBS 2011 is the DNS server for the network, so I am concerned that something is wrong there. What steps can I take to fix the DNS settings on the server?