> For the complete documentation index, see [llms.txt](https://docs.openiam.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openiam.com/troubleshooting/message-broker.md).

# The message broker

RabbitMQ — a cluster that will not form, a management UI you cannot reach, and a queue the consumer cannot get past.

RabbitMQ carries every request between OpenIAM's services, so a broker that cannot form a cluster or resolve its own hostname stops the whole platform rather than one part of it.

* [The cluster went out of order](/troubleshooting/message-broker/1-rabbitmq-reinit.md) — re-initialising a broker that has lost its state, and the vhosts the services need back
* [No service starts, and every log ends in an AMQP timeout](/troubleshooting/message-broker/3-rabbitmq-connection-timeout.md)
* [The management UI is not reachable on RPM](/troubleshooting/message-broker/2-rabbitmq-ui.md)
* [The ESB restarts in a loop over one audit log message](/troubleshooting/message-broker/4-audit-queue-poison-message.md)


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