We'll keep you posted as we know more.
We're still working to correct this issue. It appears to be a cache issue at these ISPs. Until we're able to have it resolved, you can use a proxy to access communities on s15.
Update: We're still attempting to work with both ISPs. The issue has been escalated on their end. We'll keep you posted until we have a resolution.
Update: We've received a response from Plus.net requesting more information which we've now provided.
Edited by Brian, Mar 24 2011, 11:27 AM.