Unable to create asp.net session on a cookieless web application

Question

I have a cookieless web application based on asp.net 4.5.

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Answer 1

Thanks to @AdrianWragg, I found it! The redirection was done through a reverse proxy but this server had an ISAPI filter that was removing the session Id from the request, after I removed the ISAPI filter everything worked just fine.

Answer 2

Can you try to change your configuration in the web.config to:

<sessionState mode="InProc" cookieless="false" timeout="10"/>

?