Invalid TLS version Azure Service Bus

[LukeRH]

Hi, We are seeing the following exception message "Amqp.AmqpException: Invalid TLS version Azure Service Bus" when sending messages to a new Azure Service Bus with TLS 1.2 enforced as default. It looks like AMQPNetLite attempts to connect using TLS 1.0. Does AMQPNetLite support TLS 1.2?

To reproduce create a new AZ service bus with a topic and sub then run the Azure Service Bus topic example provided in the repo.

The workaround is to configure AZ service bus to accept connections using<TLS 1.2 as described here https://docs.microsoft.com/en-gb/azure/service-bus-messaging/transport-layer-security-enforce-minimum-version?WT.mc_id=Portal-Microsoft_Azure_ServiceBus but its not an ideal solution.

Thanks Luke

[xinchen10]

Which .net runtime, .net framework, .net core or something else?

By default the library uses SslProtocols.Default which depends on the framework and version you use. To enforce TLS12, create a ConnectionFactory object and set ConnectionFactory.SSL.Protocols = SslProtocols.Tls12, and then use it to create a connection.

[LukeRH]

We are using .Net Framework 4.8

[xinchen10]

Have you tried using SSL settings on ConnectionFactory? Does it work?

[LukeRH]

@xinchen10 Apologies for not replying sooner. Using the connection factory as suggested worked. ConnectionFactory connectionFactory = new ConnectionFactory(); connectionFactory.SSL.Protocols = System.Security.Authentication.SslProtocols.Tls12;

Thanks for your help Luke