.NetCore RabbitMQ Connection Exception

[Alper]

I get an error when i try to connect RabbitMQ with .netCore Backend Web API.

I settuped RabbitMQ with windows installer and looked up your writes and i cannot found the solution.

The problem is (From .NetCore): System.Exception: InvalidOperationException: No RabbitMQ connections are available to perform this action.

ConnectionString: "amqp://guest:guest@localhost:5672//"

But when i start a connection, creating a new connection with name like [::1]:56894.

Checked these commands and everything is fine : rabbitmq-diagnostics listeners / rabbitmq-diagnostics status / rabbitmq-diagnostics environment.