I had to rebuild our Mac OS X Server (Xserve). I backed up the entire cached updates folder before rebuilding, then I restored it after rebuilding the server. The server is pointing to the same cached updates folder, but SUS doesn't seem to be pulling anything down. Here's the error I'm seeing in the log:
Hey. This helped with my install. I was getting this error. It seems to be a problem with the DNS. But this fixed the problem for me. Just point the entry to your server and it will load in all the update and everything is now working. No more errors.