zimbra 1 is LDAP , Zimbra 2 is MTA , ZImbra 3 is Mailstore

Should i need config three server zimbra account same password in order to ssh access ( zimbra account password same for all server ???)
i follow the guide below but seem still some problem

Mail Queue Monitoring - Zimbra :: Wiki

It seem some communication but if test with these error found

I tried ssh -vi .ssh/zimbra_identity -o strictHostKeyChecking=no zimbra@zim02.wisers.com -p 22

It said cannot find ssh/zimbra_identity no such file / directory.. ( but is seem it 's still updating the mail queue monitoring / scanning.)

Any idea ?