[rabbitmq-discuss] RabbitMQ server sending unexpected FIN/ACK

[James Andres]

Hello,

I have a 3 node rabbit 3.2.3 cluster which is working great most of the 
time. Occasionally, however, our clients (Pika 0.9.13 / 0.9.14p1) receive 
an abrupt TCP level disconnect. These FIN/ACK's generally happen between 
start / start-ok or the first tune / tune-ok. There are no messages in the 
rabbitmq server logs around the time of the tcp FIN/ACK.

An sketch of one of our failing connections with any large gaps in timing 
highlighted:

   later ... CLIENT -> SERVER says SYN...
   later ... SERVER -> CLIENT says SYN/ACK
   later ... CLIENT -> SERVER says ACK
   later ... CLIENT -> SERVER says AMQP,Protocol-Header 9-1
   later ... SERVER -> CLIENT says ACK
   later ... SERVER -> CLIENT says Connection.Start
   later ... CLIENT -> SERVER says ACK
8s later ... CLIENT -> SERVER says Connection.Start-Ok
   later ... SERVER -> CLIENT says Connection.Tune
   later ... CLIENT -> SERVER says ACK
2s later ... SERVER -> CLIENT says FIN,ACK
   later ... CLIENT -> SERVER says ACK
   later ... CLIENT -> SERVER says Connection.Tune-Ok
   later ... SERVER -> CLIENT says RST
   later ... CLIENT -> SERVER says Connection.Open
   later ... SERVER -> CLIENT says RST

Does anyone know of a good place to start debugging this? Are there 
relevant timeouts I should be aware of?

Much appreciated,

- James
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