If you are hosting SSRS environment on multiple IIS servers, you will need to use a common State Server or SQL Server to store session data. Please note that using In-Process mode or using State Server Mode in the server itself will cause session errors such as “ASP.NET Session has expired”. In order to avoid this issue:
In the web.config file:
<pages buffer="true" validateRequest="true" enableSessionState="false" enableViewState="true" viewStateEncryptionMode="Always" controlRenderingCompatibilityVersion="4.0" clientIDMode="AutoID">
<%@Page enableSessionState="true">
<sessionState mode="StateServer" stateConnectionString="tcpip=SampleStateServer:42424" cookieless="false" timeout="20"/>
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnections
References:
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