[rabbitmq-discuss] RabbitMQ hangs, does not accept connections

Simon MacMullen simon at rabbitmq.com
Tue Dec 13 10:42:31 GMT 2011

Hmm. I can't really say anything from your description - can you post 
the logs somewhere? It's possible that your definition of "nothing 
unusual in the logs" differs from mine.

And when you say that "the server refused attempts to connect", what 
exactly do you mean. You say that a TCP connection *could* be 
established - so does your client hang during AMQP handshaking? 
Disconnect? Something else?

Cheers, Simon

On 12/12/11 16:24, Dmitri Minaev wrote:
> Hello,
> We use RabbitMQ for about a year now. From time to time I upgraded it
> and switched from one server to another. About a month ago the last
> such transition took place. I installed new RabbitMQ (2.7) on a new
> server and our web application was reconfigured. Quite soon we faced
> new problems. After some days of stable work clients could not connect
> to RabbitMQ. I could list run rabbitmqctl, list queues, kill
> connections, but the server refused attempts to connect. That is, TCP
> socket was available and telnet could connect to port 5672, but the
> AMQP connection could not be established. There was nothing unusual in
> the logs. vm_memory_high_watermark is set to 0.7 and there's still
> plenty of free memory.
> After a couple of such failures I tried to downgrade to 2.6.1, but the
> problem remained. The last time I disabled IPv6, but today we hit the
> same trouble again.
> I think I must have done something wrong when setting up the
> environment, but what could that be?
> OS: Ubuntu 10.04 LTS.
> 16GB RAM.
> RabbitMQ 2.6.1
> Erlang R13B03 (erts-5.7.4) (package erlang-nox from Ubuntu repository)
> Client: php-amqplib

Simon MacMullen
RabbitMQ, VMware

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