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I'm using ssh-agent for caching private keys; it's working well before connecting remote PC its not asking for a PASSPHRASE but its asking remote user password. Ex:

host$ sudo ssh-agent bash 
      sudo ssh localhost2.localdomain

after that its not asking passphrase its asking only remote user password.

  • Welcome to U&L! I updated the text your question slighty, but I also removed all 4 or 5 OS tags that you added, then added the more appropriate ssh-agent tag. That will help you find the people who can best help you. – Jeff Schaller Sep 13 '15 at 20:36
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With that sudo, you are switching user to root. I suspect that was not intended, as ssh will then go looking for keys in /root/.ssh/ and, finding no applicable key there, will just ask for remote user password.

I usually run exec ssh-agent bash or similar – remaining then with my own user.

And then I run ssh-add, to load (most of) my keys into the agent, before running ssh – again usually without sudo.

If I'm wrong, and the sudo was intentional, can you tell us what you are trying to achieve thereby?

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