Try to execute
1. In the web application, the web.config file sets the sessionState timeout like this: (in minutes)
<sessionState timeout="30" />
2. Make sure the application application pool timeout is greater than or equal to the above time (you can run the following command from the iisexpress installation folder)
appcmd set config /section:applicationPools /[name='YourAppPoolName'].processModel.idleTimeout:0.00:30:00
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