RabbitMQ 3.8.11 Unable to authenticate

[Scott McCollough]

We're currently stuck on v3.8.9. Whenever I upgrade to v3.8.11 I see this error:

RabbitMQ.Client.Exceptions.BrokerUnreachableException

Authentication failed, see inner exception.

The client and server cannot communicate, because they do not possess a common algorithm.

...and we have no consumers on the queues.

If I roll back to v3.8.9 everything works again.

[Wesley Peng]

How do you authenticate it? Do you have SSL? If so what is SSL version?

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[Scott McCollough]

Our connections are brokered through a load balancer with an L7Tcp Service. There is no option for SSL.

[Scott McCollough]

After speaking to our architect I think we've narrowed down the issue to the .NET client 5.x. 

[Luke Bakken]

Hello,

You haven't provided enough information for us to assist you.

Please provide the following information:

• Erlang version
• Operating system used for RabbitMQ and your .NET application
• .NET Core / Framework version
• Complete RabbitMQ configuration files
• Complete RabbitMQ log files
• Complete .NET exception. A snippet is not sufficient
• Code that shows exactly how you are connecting to RabbitMQ

Please answer these questions:

• Can you reproduce the problem when the load balancer is not used?
• You say "client and server cannot communicate, because they do not possess a common algorithm", which implies that you are using TLS. Yet, you contradict yourself later on. Which is it?
  
• What is your exact procedure for upgrading to 3.8.11?