None of the specified endpoints were reachable

Question

There is intermittent issue in rabbitmq while publishing message from .net application. It is creating lots of noise in the system. I have tried googling but could not found root cause of an issue.

Here is the error I can see in application log,

None of the specified endpoints were reachable
Endpoints attempted:
------------------------------------------------
endpoint=amqp-0-9://localhost:5672, attempts=1
System.TimeoutException: Connection to amqp-0-9://localhost:5672 timed out
   at RabbitMQ.Client.Impl.SocketFrameHandler_0_9.Connect(TcpClient socket, AmqpTcpEndpoint endpoint, Int32 timeout)
   at RabbitMQ.Client.Impl.SocketFrameHandler_0_9..ctor(AmqpTcpEndpoint endpoint, ObtainSocket socketFactory, Int32 timeout)
   at RabbitMQ.Client.Framing.Impl.v0_9_1.ProtocolBase.CreateFrameHandler(AmqpTcpEndpoint endpoint, ObtainSocket socketFactory, Int32 timeout)
   at RabbitMQ.Client.ConnectionFactory.FollowRedirectChain(Int32 maxRedirects, IDictionary`2 connectionAttempts, IDictionary`2 connectionErrors, AmqpTcpEndpoint[]& mostRecentKnownHosts, AmqpTcpEndpoint endpoint)
================================================
Stack trace:
   at RabbitMQ.Client.ConnectionFactory.CreateConnection(Int32 maxRedirects)
   at RabbitMQ.Client.ConnectionFactory.CreateConnection()

Answer 1

I have resolved this issue by making RabbitMQ Connection object singleton to make sure reuse connection instead of making new connection everytime.