In this article I will explain how to solve Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. To describe it, please see this image below:



To solve this error I started Asp.net state service from services to start the service just follow below steps

Go to Control Panel ---> Administrative Tools ---> Computer Management ---> Services and Applications ---> Services 

Now Select Asp.Net State Service

After that Right Click on Asp.net State Service and choose “Start” option.



After start the service your problem will solve automatically. Hope it helps