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I am able to ssh to hp machine through root user without password but not through user.
Please let me know if I am wrong at any point?
Your title says you're unable to, but your post says you ARE able to. Which is it?
If you're saying that you can SSH without a password as a root user, but can't as a 'regular' user, that would be correct. You've only swapped the keys for the root user above. You need to do this for every user you want to be able to do passwordless-logins with.
I tested the same in between the two linux machine and it was working fine but in between linux and HP-UX machine
But in between linux and HP-UX machine what? It was or wasn't working?
If this works between Linux systems, but just not to HP-UX, it may be the SSH you're using on HP-UX. Solaris used to be the same way, you could connect via SSH, but keyswaps didn't work. You had to remove the 'built-in' SSH server, and install OpenSSH, which worked flawlessly.
Are you using OpenSSH on HP-UX, or the default SSH that comes with it? You can try to install OpenSSH, and see if that works, chances are it will.
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