IIS 7 and Above
Cookie problem in IIS7 and IE: New session id with every request
Re: Cookie problem in IIS7 and IE: New session id with every request
Jul 03, 2008 11:14 PM|steve schofield|LINK
Have you tried running the app pool in classic mode to see if the same behavior exists?
Windows Server MVP - IIS
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Install, Configure, Forget