rabbit-mq in Ubuntu 16.04 fails to start without clear message error

I had a rabbit-mq service running and I suddenly see that the service is not running and that I cannot start it. I have checked other existing questions regarding this kind of problems, and most of them point to problems in /etc/hosts configuration The result of restart is: /etc/init.d/rabbitmq-server restart [....] Restarting rabbitmq-server (via systemctl): rabbitmq-server.serviceJob for rabbitmq-server.service failed because the control process exited with error code. See "systemctl status rabbitmq-server.service" and "journalctl -xe" for details. failed! And the detail in systemctl is: systemctl status rabbitmq-server.service rabbitmq-server.service - RabbitMQ Messaging Server Loaded: loaded (/lib/systemd/system/rabbitmq-server.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since mié 2018-10-03 13:07:32 CEST; 42s ago Process: 5545 ExecStop=/usr/sbin/rabbitmqctl stop (code=exited, status=2) Process: 4564 ExecStartPost=/usr/lib/rabbitmq/bin/rabbitmq-server-wait (code=exited, status=2) Process: 4563 ExecStart=/usr/sbin/rabbitmq-server (code=exited, status=1/FAILURE) Main PID: 4563 (code=exited, status=1/FAILURE) systemd: Starting RabbitMQ Messaging Server... rabbitmq: Waiting for rabbit@edr ... rabbitmq: pid is 4571 ... systemd: rabbitmq-server.service: Main process exited, code=exited, status=1/FAILURE rabbitmq: Error: process_not_running systemd: rabbitmq-server.service: Control process exited, code=exited status=2 systemd: Failed to start RabbitMQ Messaging Server. systemd: rabbitmq-server.service: Unit entered failed state. systemd: rabbitmq-server.service: Failed with result 'exit-code'. The result of journalctl -xe gives not much more info. And the file /var/log/rabbitmq/startup_err shows a message truncated like this: Crash dump is being written to: erl_crash.dump...done Kernel pid terminated (application_controller) ({application_start_failure,kernel,{{shutdown,{failed_to_start_child,net_sup,{shutdown,{failed_to_start_child,auth,{"Cookie file /var/lib/rabbitmq/.erl tail: /var/log/rabbitmq/startup_err: file truncated Is there another way to find the exact error when rabbit-mq fails to start?