SG Broadband Community

I have 6 computers at my business, we use AT&T DSL. I have a distributor that I use ( http://www.avadse.com ) and I have been able to use thier website without problem upto about a week ago. Now I cannot connect from any of my computers at work, cannot even ping the site. I can get to the site from home using Charter cable without issues. I took a laptop home from work, it connect there also. I donot know anyone else using ATT so I canot test elsewhere on ATT. I have not had problems with anyother site other than the one listed above. I thought maybe ATT started blocking the site for some reason, but they said they cannot give that information out. Any ideas what could be the problem.
Thanks

They have been having problems with their DNS servers in the Bellsouth territory.

http://ap.google.com/article/ALeqM5guSE ... wD8TAE8UG0

Changing the DNS server list on your machines at work should help.