May 24, 2009 11:18 PM|Nai-Dong Jin - MSFT|LINK
From your description, it seems that you have an httpmodule and it works on development side, but fails on product machine, right?
As it works in your local side, it indicates that the logic of your HttpModule works. And I think the cause of the issue is that you didn't setup the module properly on your product side.
You may try the following article, and especially for "Deploying Module" part.