Got error while running this “ ansible -m ping all ” command but could be able to ssh

问题

I am trying to run the command ansible -m ping all from one EC2 instance to another ect2 instance using a different user name than ubuntu. For both EC2 instances, the operating system is Ubuntu 16.04. I can ssh from host to remote. And I get the following error:

fatal: [uat]: UNREACHABLE! => 
{"changed": false, 
"msg": "EOF on stream; last 100 lines received:\nssh_exchange_identification: Connection closed by remote host\r", 
"unreachable": true}

来源：https://stackoverflow.com/questions/62465429/got-error-while-running-this-ansible-m-ping-all-command-but-could-be-able-t