IIS 6 seems to be limited (by default at least) to an http header of 16k. I have a 3rd party tool that is talking to the web server (ajax) and sending an http header that is bigger than that. Since I can't control the 3rd party tool, I am hoping to find an IIS 6 setting that will let me increase the maximum header size to 32768 or whatever.
Look at the value in
This value determines the upper limit of the request header, although there are caveats. From TechNet:
Here is the TechNet article with more information, including other tuning parameters.