Symptoms When trying to request some data from the Tsplice API, an error message is returned to the client: HTTP Error 500.30 - ASP.NET Core app failed to start and the Windows Application event log shows a message like the following: | Code Block |
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Category: Microsoft.AspNetCore.Hosting.Diagnostics
EventId: 6
Application startup exception
Exception:
System.InvalidOperationException: The Negotiate Authentication handler cannot be used on a server that directly supports Windows Authentication. Enable Windows Authentication for the server and the Negotiate Authentication handler will defer to it.
at Microsoft.AspNetCore.Authentication.Negotiate.PostConfigureNegotiateOptions.PostConfigure(String name, NegotiateOptions options)
at Microsoft.Extensions.Options.OptionsFactory`1.Create(String name)
at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
at System.Lazy`1.CreateValue()
at Microsoft.Extensions.Options.OptionsCache`1.GetOrAdd[TArg](String name, Func`3 createOptions, TArg factoryArgument)
at Microsoft.Extensions.Options.OptionsMonitor`1.Get(String name)
at Microsoft.AspNetCore.Authentication.Negotiate.Internal.NegotiateOptionsValidationStartupFilter.<>c__DisplayClass2_0.<Configure>b__0(IApplicationBuilder builder)
at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken)
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Explanation This error occurs because Windows Authentication is disabled in the web server application’s Authentication settings. Resolution Follow the instructions at Installation Requirements to fix the Windows Authentication setting. |