I dont know why SSH and Hadoop connecting to wrong place

I have 3 virtual machines: 1. master@master-virtualbox 2. worker1@worker1-virtualbox 3. worker2@worker2-virtualbox When I try to copy ssh id from worker1 to master, asked for password which I dont know what is it. I dont even know what password!!!. Anyway, I tried the password I created for all the machines (They all are same password) and ended up with worker1@master-virtualbox: Permission denied (publickey,keyboard-interactive). I dont even have master host or master user in the worker machines vice-versa no worker1 or worker2 users in master machine. I dont know where is it trying to connect. By the way I get similar error when I run start-dfs.sh command from my master machine. worker1@worker1-virtualbox: master@worker1-virtualBox: Permission denied (publickey,keyboard-interactive). worker2@worker2-virtualbox: master@worker2-virtualBox: Permission denied (publickey,keyboard-interactive). However when I connect (ssh worker1@worker1-virtualbox or ssh worker2@worker2-virtualbox) from master or from worker machines to connect master (ssh master@master-virtualbox) or worker to worker(ssh worker1@worker1-virtualbox or ssh worker2@worker2-virtualbox) etc. Connecting without password , no problem. Any help will be appreciated. Thanks in advance