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This property specifies the server name and the port when the session state is stored remotely. The stateConnectionString attribute is required when the SessionStateSection.Mode is set to System.Web.SessionState.SessionStateMode.StateServer.
Make sure the ASP.NET state service is running on the remote server that stores the session-state information. This service is installed with ASP.NET and is located by default at [drive:]\WINDOWS\Microsoft.NET\Framework\VersionNumber\aspnet_state.exe.