These steps work for version 6.0.8 too!
Code:
$zmprov ms server.domain.com zimbraRemoteManagementPort 22
$zmsshkeygen
$zmupdateauthkeys
Verify with
Code:
$ssh -vi .ssh/zimbra_identity -o strictHostKeyChecking=no zimbra@server.domain.com -p 22
Thanks a lot,
Pancho