App Service returns nothing but no changes done

Question

I have Azure App Service (NET 8) running some APIs and few static pages. All worked well for months. Today I noticed that all APIs and pages stopped to work. At request (both to API and static pages) it returns 200 with empty response.

Local debug works well - APIs and pages response correct.

Nothing changed in the service. I restarted it several times but it doesn't help. I did Republish few times but result is the same - 200 with empty response.

On Azure portal nothing indicates about a problem.

Here is URL example that should return data: https://gamingwebapp.azurewebsites.net/api/Ads/GetIndieAds

In Application Event Logs I found:

Category: Microsoft.AspNetCore.Server.IIS.Core.IISHttpServer
EventId: 0

Unexpected exception in static IISHttpServer.HandleRequest.

Exception: 
System.MissingMethodException: Method not found: 'System.Nullable`1<System.Net.Security.TlsCipherSuite> Microsoft.AspNetCore.Connections.Features.ITlsHandshakeFeature.get_NegotiatedCipherSuite()'.
   at Microsoft.AspNetCore.Server.IIS.Core.IISHttpServer.IISContextFactory`1.CreateHttpContext
   at Microsoft.AspNetCore.Server.IIS.Core.IISHttpServer.HandleRequest(IntPtr pInProcessHandler, IntPtr pvRequestContext)

Answer 1

Solved the problem by removing SignalR nuget.

Answer 2

Hi @60856927,
Welcome to the Microsoft Q&A Platform!
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer.

Solution:
Solved the problem by removing SignalR nuget.

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