''MS-ASPNETCORE-TOKEN' does not match the expected pairing token' when calling deployed .net core API on IIS

I am receiving the following exception in the logs and event viewer when calling an endpoint in a .Net core application (3.1):

'MS-ASPNETCORE-TOKEN' does not match the expected pairing token

I have this application deployed using IIS under the default web site. I had read this exception may be due to a discrepancy with Kestrel and IIS, so I updated the CreateWebHostBuilder() to include UseKestrel() and UseIISIntegration(), specifically in that order.

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>    WebHost.CreateDefaultBuilder(args)    .ConfigureLogging(logger =>    {      logger.ClearProviders();      logger.AddConsole();      logger.AddDebug();      logger.AddEventLog();    })    .UseStartup<Startup>()    .UseKestrel()    .UseIISIntegration();  }  

In the appsettings file, I set the url to "Urls": "http://localhost:5001". This doesn't seem to be respected because navigating to that URL brings up 'This page cannot be displayed.' There is a port provided in the log, but I think this is supposed to be the kestrel port:

Now listening on: http://localhost:20274 Application started. Press Ctrl+C to shut down.

I am calling the endpoint at that port. As an additional note, I have this running with the OutofProcess hosting model.

Any suggestions on troubleshooting or resolution for this issue?

https://stackoverflow.com/questions/65605480/ms-aspnetcore-token-does-not-match-the-expected-pairing-token-when-calling-d January 07, 2021 at 09:28AM