unhandled System.NullReferenceException: on debug clean .net coreweb api / exception at System.Buffer.Memmove(Byte& dest, Byte& src, UIntPtr len)

Question

i have last vs 2022 17.10.5 no updates possible when i do new > asp.net core web api > some location > create and hit debug with no change then it open browser with url https://localhost:7125/swagger ahd it do not open because of ERR_CONNECTION_CLOSED and in console of .net i see

      Unhandled exception while processing 0HN5MOO0P5675.
      System.NullReferenceException: Object reference not set to an instance of an object.
         at System.Buffer.Memmove(Byte& dest, Byte& src, UIntPtr len)
         at System.Net.Security.SafeDeleteContext.AcceptSecurityContext(SafeFreeCredentials& inCredentials, SafeDeleteSslContext& refContext, ContextFlags inFlags, Endianness endianness, InputSecurityBuffers inSecBuffers, SecurityBuffer& outSecBuffer, ContextFlags& outFlags)
         at System.Net.SSPISecureChannelType.AcceptSecurityContext(SafeFreeCredentials credential, SafeDeleteSslContext& context, InputSecurityBuffers inputBuffers, ContextFlags inFlags, Endianness endianness, SecurityBuffer& outputBuffer, ContextFlags& outFlags)
         at System.Net.Security.SslStreamPal.AcceptSecurityContext(SafeFreeCredentials& credentialsHandle, SafeDeleteSslContext& context, ReadOnlySpan`1 inputBuffer, Byte[]& outputBuffer, SslAuthenticationOptions sslAuthenticationOptions)
         at System.Net.Security.SslStream.GenerateToken(ReadOnlySpan`1 inputBuffer, Byte[]& output)
         at System.Net.Security.SslStream.NextMessage(ReadOnlySpan`1 incomingBuffer, ProtocolToken& token)
         at System.Net.Security.SslStream.ProcessTlsFrame(Int32 frameSize, ProtocolToken& message)
         at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](Boolean receiveFirst, Byte[] reAuthenticationData, CancellationToken cancellationToken)
         at System.Net.Security.SslStream.ProcessAuthenticationWithTelemetryAsync(Boolean isAsync, CancellationToken cancellationToken)
         at Microsoft.AspNetCore.Server.Kestrel.Https.Internal.HttpsConnectionMiddleware.OnConnectionAsync(ConnectionContext context)
         at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1.ExecuteAsync()
fail: Microsoft.AspNetCore.Server.Kestrel[0]
      Unhandled exception while processing 0HN5MOO0P5676.
      System.NullReferenceException: Object reference not set to an instance of an object.
         at System.Buffer.Memmove(Byte& dest, Byte& src, UIntPtr len)
         at System.Net.Security.SafeDeleteContext.AcceptSecurityContext(SafeFreeCredentials& inCredentials, SafeDeleteSslContext& refContext, ContextFlags inFlags, Endianness endianness, InputSecurityBuffers inSecBuffers, SecurityBuffer& outSecBuffer, ContextFlags& outFlags)
         at System.Net.SSPISecureChannelType.AcceptSecurityContext(SafeFreeCredentials credential, SafeDeleteSslContext& context, InputSecurityBuffers inputBuffers, ContextFlags inFlags, Endianness endianness, SecurityBuffer& outputBuffer, ContextFlags& outFlags)
         at System.Net.Security.SslStreamPal.AcceptSecurityContext(SafeFreeCredentials& credentialsHandle, SafeDeleteSslContext& context, ReadOnlySpan`1 inputBuffer, Byte[]& outputBuffer, SslAuthenticationOptions sslAuthenticationOptions)
         at System.Net.Security.SslStream.GenerateToken(ReadOnlySpan`1 inputBuffer, Byte[]& output)
         at System.Net.Security.SslStream.NextMessage(ReadOnlySpan`1 incomingBuffer, ProtocolToken& token)
         at System.Net.Security.SslStream.ProcessTlsFrame(Int32 frameSize, ProtocolToken& message)
         at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](Boolean receiveFirst, Byte[] reAuthenticationData, CancellationToken cancellationToken)
         at System.Net.Security.SslStream.ProcessAuthenticationWithTelemetryAsync(Boolean isAsync, CancellationToken cancellationToken)
         at Microsoft.AspNetCore.Server.Kestrel.Https.Internal.HttpsConnectionMiddleware.OnConnectionAsync(ConnectionContext context)

why is that / what i did wrong / how to trubleshot this ? thanks and regards !

Dorian · Accepted Answer · 2024-08-07 12:25:23Z

2

for future searchers. solution was

dotnet dev-certs https --clean

dotnet dev-certs https --check

dotnet dev-certs https 

dotnet dev-certs https --trust

no idea what was wrong here befor and why this was failing but this helped.

answered Aug 7, 2024 at 12:25

Dorian

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1 Comment

Sean Kearon Over a year ago

Fantastic - worked perfectly. Thanks!

buymeacoffee · Accepted Answer · 2024-08-07 10:41:49Z

0

Try to find launchsettings.json file, and find this section.

Solution

Change the order of the applicationUrl, it's ①② in the screenshot, change it to ②①.

Workaround

Use IISExpress, instead of https.

answered Aug 7, 2024 at 10:41

buymeacoffee

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