Mine wasn't a login problem. The browsers couldn't find Gatorchatter by name, found every address that I entered but not Gatorchatter.
I think Coach might be having the same problem as you.
The gatorchatter.com name resolves to 45.33.115.217. But you can't use that ip address directly as it will generate an error message. The ip address is apparently also shared with reformedcommunion.org.
Gren's solution is a good one. If you have multiple computers on your local network, changing the nameservers in the router will cause them to propagate to all computers on that network.