I have run into the dreaded “Double Hop” Issue many times over the last few years, I have even heard horror stories from developers in other companies. To that end I have decided to put together a list of useful links on this issue. Here is a few that I found helpful. If you have more please share them via the comments section.
KB Articles
http://support.microsoft.com/kb/910449
http://support.microsoft.com/kb/891031
http://support.microsoft.com/kb/810572
Web Cast
http://support.microsoft.com/servicedesks/webcasts/seminar/shared/asp/view.asp?url=/servicedesks/webcasts/en/WC102704/manifest.xml