Unable to make the session state request to the session state server

Question

Our site is currently having this problem. Basically it only happen when we click some particular links where it will pop-up a new window.
This is the error message we

Answer 1

I recently ran into this issue and none of the solutions proposed fixed it. The issue turned out to be an excessive use of datasets stored in the session. There was a flaw in the code that results in the session size to increase 10x.

There is an article on the msdn blog that also talks about this. http://blogs.msdn.com/b/johan/archive/2006/11/20/sessionstate-performance.aspx

I used a function to write custom trace messages to measure the size of the session data on the live site.