Fixing SSH login slow issue

on the new VBox nodes,  ssh access is slow.

debug2: key: /root/.ssh/id_dsa ((nil)),
debug2: key: /root/.ssh/id_ecdsa ((nil)),

….Slow here…

debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred publickey,keyboard-interactive,password


To Solve the problem, I can see the Box with public network access can reply soon,
Its the reverse ip DNS issue,

On Server side: sshd_config

Fixing SSH login long delay

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