IIS 408 Logging

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http://serverfault.com – We have some web systems that in the past have experienced HTTP 408 response codes when making a request. They can happen at any time, there doesn't seem to be any pattern to them. The problem we have is that the client request goes through a TMG gateway, and IIS never logs the 408. The last request I see is a 200, and subsequently a client received a 408. Do 408's make it to IIS logs, or are 408's higher up in the stack meaning the request never makes it to IIS? (HowTos)