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I use PuTTY and followed this tutorial:

Every time I login I"m being asked to input the passphrase. How do I avoid having to do this?

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You need to run pageant and add keys to it once after system startup or just leave passwords empty.

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On page 2 of that tutorial (part 5) when generating the key you enter a passphrase which is needed to access that key. Leave the password blank.

If putty doesn't allow you to create a key without a password then you could create the key with ssh-keygen on the remote *nix machine and copy it back to your machine.

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