[rabbitmq-discuss] Question about Server Fail to Forward messages

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Hi,
I install rabbitmq-server on ubuntu by apt-get to many servers. Some of them can not forward messages, but others can. When I run "service rabbitmq-server status", they all return the status (indicate running). Can I run something like test, to find out whether rabbitmq-server can forward message or not? And how can I get the reason of fail on server? 
Thank you very much!

Wish you have a good day!
Sincerely,
Peng.Shi
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