RabbitMQ broken after maintenance "Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only"

Hey guys,
After an automatic scheduled maintenance, my RabbitMQ server does not start anymore. I am always getting the error “Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only”

Full error: error:{badmatch,{error,{{shutdown,{failed_to_start_child,auth,{“Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only”,[{auth,init_no_setcookie,0,[{file,“auth.erl”},{line,313}]},{auth,init,1,[{file,“auth.erl”},{line,165}]},{gen_server,init_it,2,[{file,“gen_server.erl”},{line,851}]},{gen_server,init_it,6,[{file,“gen_server.erl”},{line,814}]},{proc_lib,init_p_do_apply,3,[{file,“proc_lib.erl”},{line,240}]}]}}},{child,undefined,net_sup_dynamic,{erl_distribution,start_link,[#{clean_halt => false,name => rabbit_prelaunch_13@localhost,name_domain => shortnames,net_tickintensity => 4,net_ticktime => 60,supervisor => net_sup_dynamic}]},permanent,false,1000,supervisor,[erl_distribution]}}}}

Does anyone have ideas for what I can do to solve this issue?
Thanks in advance.
Michael

Hi Michael,

To avoid duplicate threads, let’s continue discussing this in the support ticket we have open.

Regards,

Matt

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