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You can find a lot of debugging and deploying problems while developing applications in .NET and Visual Basic here. There are also some querying tips in SQL and typical source codes which might be useful shared here.

ASP.NET State Service

Error :
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. If the server is on a remote machine, please ensure that it accepts remote requests by checking the
value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Param
eters\AllowRemoteConnection. If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.


This is also one of the mostly retrieved errors. This error occurs when using StateServer mode for the sessionState in web.config, yet the ASP.NET State Service is not started.
I met this error when I first made a web application. After I get the solution, I ask a little about about StateServer sessionState mode to a senior.

When making an application with login page, u can consider using StateServer for the sessionState mode, because when u use this mode, u don't have to login again and again, just have to refresh the web page, because the session is still kept on server. Yet, when deploying the application, should omit it, or change it to InProc mode. I used only these 2 modes. Never use the SQLServer mode.

e.g.
<sessionState mode="StateServer" stateconnectionstring="tcpip=127.0.0.1:42424" sqlconnectionstring="data source=127.0.0.1;Trusted_Connection=yes" cookieless="false" timeout="200000" />



Solution:
Start the ASP.NET State Service on Services. Go to control panel -> Administrative Tools -> Services, or simply press window + Run, then type services.msc. Choose ASP.NET State Service, right-click, then Start the service. To start it automatically, choose startup type : Automatic.
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