Multiple requests not entering HttpModule ASP NET

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http://serverfault.com – I usually try to figure things out myself but I've been working on this problem for over a week and I'm not making any headway :(. I created an HTTP Module that detects the user's browser agent and redirects them if they are coming from a mobile browser. I'm using v2.0 in IIS integrated mode. I installed the DLL in the GAC and everything seems to work for the first 1000 or so requests but after that it suddenly stops working. I just can't seem to figure out why and I think I'm missing something basic in my C# knowledge. I would truly be grateful for any help I can get. public class Redirect (HowTos)