I can not export content after upgrading EPiServer.
I have not changed any enableSessionState value. The web.config are
I think you need to have the <pages> element in the root system.web not inside a location.
If you add some simple code that reads and writes session data to some project code, does it work?
We usually don't config sessionstate on/off in config anywhere but disable in using the controller attribute instead.
I installed the Alloy application and confirmed the location of the <pages> element was right.
I discovered the <sessionState mode="Off" /> in .config file. This has not been changed after the upgrade from EPi 10.4.2 to 10.8.0. But still the upgrade caused the sessionState to be disabled.
The fix was changing the sessionState elem to <sessionState mode="InProc" />