I can see your ISP from here, and they are a customer of AT&T.
It's possible that the block is one of their temporary ones, which
typically expire after a few weeks. In the meantime, Vuze (Azureus)
or µTorrent with encryption turned on and in forced mode will
probably still work well.

I recently had a new cpu built, had to reinstall all software plus BearShare, and ran into same host connection problems. Tonight, I joined this forum, found a possible answer in Aaron's post; I downloaded, extracted into the db file. And now it works! Thanks Aaron. My ISP is local phone company, Gallatin River Communications, who just changed their name to CenturyTel. Coincidence?