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How do I tell if Putty already knows about and has cached credentials for specific ssh servers?

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up vote 35 down vote accepted

Putty stores known hosts under a registry key: HKEY_CURRENT_USER\SoftWare\SimonTatham\PuTTY\SshHostKeys.

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You should accept this answer, because it's totally correct –  A. Wilson Oct 11 '13 at 13:02

Just as a side note, if you want to export the registry keys to a known_hosts file, there is a nice tool for this.

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