Not able to get to the company website internally

I have a wierd situation. I have a company website that I can access anywhere but on the internal network. The actual page is hosted offsite. The domain is the same as our exchange domain. I have checked to make sure that DNS has a forward lookup record of the webpage and external IP of the page. I still can not get this thing up and running. I have flushed DNS, tried multiple pcs. I can ping the page and resolve the IP address by domain, just can not get to it. Any ideas?

BTW-Verios says it’s my problem not theirs.