Originally Posted by sunil80
On my firewall I have mapped external port 2022 with internal port 22 for my public ip.
But when i do #ssh <my public ip> 2022 It shows error that verification failed.
And since you don't provide ANY details about things, what do you think we'll be able to tell you?? You don't tell us version/distro of Linux, if this is a new problem or an existing one, what kind of firewall, or even what the exact error is. Without details, no one can help you...as you've been told MANY times before.
Since you're an RHCE, what diagnostics have you run so far? What is the output of running the ssh daemon in the foreground, in verbose mode? What does that tell you?