Victor could you provide a bit more info about the environment that you are deploying in? This should only be a problem if (a) you are not using ipv6 mode in that charms and (b) your rabbitmq-server node is unable to resolve name like juju-vtapia-machine-20 from the configured dns server. This *should* work fine if you have dns setup properly but I think there are some cases (MaaS dns?) where the name does not get resolved properly.
Victor could you provide a bit more info about the environment that you are deploying in? This should only be a problem if (a) you are not using ipv6 mode in that charms and (b) your rabbitmq-server node is unable to resolve name like juju-vtapia- machine- 20 from the configured dns server. This *should* work fine if you have dns setup properly but I think there are some cases (MaaS dns?) where the name does not get resolved properly.