I'm working on recreating this but any more details you can provide in
the mean time will help speed that up (ie. juju crashdump and ensuing
commands that lead up to the error).

As I understand it, creation of a security group rule B with '--remote-
group A' specifies that rule B applies to any instances that use rule A.
[1]

That said, can you explain why the rule for tcp 5672:5672 is needed
along with the rule for tcp port_range_min:port_range_max? ie. Is the
former a subset of the latter?

Thanks,
Corey

[1] https://docs.openstack.org/nova/queens/admin/security-groups.html
#create-security-group-rules-for-a-cluster-of-instances

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https://bugs.launchpad.net/bugs/1813007

Title:
  Unable to install new flows on compute nodes when having broken
  security group rules

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