Unable to serialize the session state

Question

When putting my application on a web server and trying to \'log in\' I get the following error:

Server Error in \'/\' Application.
Unable to serialize the se         


        

Answer 1

If you come across this error message on SharePoint 2013, don't forget to run the following PowerShell cmdlet:

Enable-SPSessionStateService -DefaultProvision

This error message is new in SP2013; see this question for SP2010: Session state can only be used when enableSessionState is set to true either in a configuration