@DanBondarneko ,
RabbitMQ doesn't support short names. Each machine in the deployment must have a fully qualified domain name (FQDN). To ensure that each machine in the deployment has the host name that you expect, run the hostname, hostname -f, and the hostname -s commands on each machine. If any of the machines are not named as you expect or do not have an FQDN, correct the issue and run the commands again to confirm the correction.
For more information about the hostname command and its options, see the Linux man pages.
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