AWS 'Amazon MQ' - Rabbit MQ error: The client and server cannot communicate, because they do not possess a common algorithm

Question

I implemented a connection to my aws rabbit mq service with the c# RabbitMQ.Client. This connection works very well on my local machine. But when i publish my app to my iis server, running on Windows 2012 i get following exception:

None of the specified endpoints were reachable
The client and server cannot communicate, because they do not possess a common algorithm

I checked my TLS versions on my win machine with IIS Crypto and installes TLS1.2 but without any result

Also i tried every available setting combination on my ConnectionFactory, without any result. Latest version:

ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12;
new ConnectionFactory()
{
  Uri = new Uri($"amqps://{User}:{Password}@{Hostname}:{Port}/{VirtualHost}"),
  Ssl = new SslOption
  {
    CertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true,
    Enabled = true,
    Version = SslProtocols.Tls12,
    ServerName = Hostname,
    AcceptablePolicyErrors = SslPolicyErrors.RemoteCertificateChainErrors |
                                           
    SslPolicyErrors.RemoteCertificateNameMismatch |
                                             
    SslPolicyErrors.RemoteCertificateNotAvailable,
  }
};

Someone can help me to fix this problem?

Also tried this solutions: TLS 1. 2 The client and server cannot communicate, because they do not possess a common algorithm

My Setup:

1. C# .Net 5
2. IIS 8
3. RabbitMQ.Client 6.5.0
4. Windows Server 2012

Full Exception:

RabbitMQ.Client.Exceptions.BrokerUnreachableException
None of the specified endpoints were reachable
System.AggregateException: One or more errors occurred. (Authentication failed, see inner exception.)
 ---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception.
 ---> System.ComponentModel.Win32Exception (0x80090331): Der Client und der Server können keine Daten austauschen, da sie nicht über einen gemeinsamen Algorithmus verfügen.
 --- End of inner exception stack trace ---
 at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](TIOAdapter adapter, Boolean receiveFirst, Byte[] reAuthenticationData, Boolean isApm)
 at RabbitMQ.Client.Impl.SslHelper.<>c__DisplayClass2_0.<TcpUpgrade>b__0(SslOption opts)
 at RabbitMQ.Client.Impl.SslHelper.TcpUpgrade(Stream tcpStream, SslOption options)
 at RabbitMQ.Client.Impl.SocketFrameHandler..ctor(AmqpTcpEndpoint endpoint, Func`2 socketFactory, TimeSpan connectionTimeout, TimeSpan readTimeout, TimeSpan writeTimeout)
 at RabbitMQ.Client.Framing.Impl.IProtocolExtensions.CreateFrameHandler(IProtocol protocol, AmqpTcpEndpoint endpoint, ArrayPool`1 pool, Func`2 socketFactory, TimeSpan connectionTimeout, TimeSpan readTimeout, TimeSpan writeTimeout)
 at RabbitMQ.Client.ConnectionFactory.CreateFrameHandler(AmqpTcpEndpoint endpoint)
 at RabbitMQ.Client.EndpointResolverExtensions.SelectOne[T](IEndpointResolver resolver, Func`2 selector)
 --- End of inner exception stack trace ---
 at RabbitMQ.Client.EndpointResolverExtensions.SelectOne[T](IEndpointResolver resolver, Func`2 selector)
 at RabbitMQ.Client.Framing.Impl.AutorecoveringConnection.Init(IEndpointResolver endpoints)
 at RabbitMQ.Client.ConnectionFactory.CreateConnection(IEndpointResolver endpointResolver, String clientProvidedName)
 at RabbitMQ.Client.ConnectionFactory.CreateConnection(IEndpointResolver endpointResolver, String clientProvidedName)
 at RabbitMQ.Client.ConnectionFactory.CreateConnection(String clientProvidedName)\r\n   at RabbitMQ.Client.ConnectionFactory.CreateConnection()
 at AlfaTools.Interface.RabbitMQ.RabbitMQService..ctor(IUnitOfWork unitOfWork) in C:\\Users\\Kevve\\Github\\alfatools-backend\\AlfaTools.Interface.RabbitMQ\\RabbitMQService.cs:line 96
 at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
 at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
 at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
 at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
 at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
 at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
 at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
 at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass2_0.<RealizeService>b__0(ServiceProviderEngineScope scope)
 at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
 at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired)
 at lambda_method4145(Closure , IServiceProvider , Object[] )
 at Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider.<>c__DisplayClass4_0.<CreateActivator>b__0(ControllerContext controllerContext)
 at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
 at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
 at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()\r\n--- End of stack trace from previous location ---
 at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)