ASP.NET HttpContext.Current.Session is suddenly always null
You have a problem with an ASP.NET MVC4 application where it worked fine and was pulling / pushing various objects in and out of the session.
After a problem with my machine, all of a sudden HttpContext.Current.Session always throws null reference exceptions whenever they were referenced.
This was not due to a code change, but obviously to my machine.
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The problem was that after my machine crashed and restarted, the ASP.NET public service (Named aspnet_state) was no longer working. I went into windows services and started this service and the session started working correctly again.
It took me a while to find the answer to this question and I couldn't see it anywhere, so I thought it might be worth adding if it helps anyone.
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