/etc/rabbitmq/rabbitmq.conf.d/50_stomp is in rabbitmq-stomp 2.7.1-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | RABBITMQ_SERVER_START_ARGS='-rabbitmq_stomp tcp_listeners [{"0.0.0.0",61613},{"0.0.0.0",6163}]'
|