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Putty has this setting in SSH/Auth, but I don't see where to set it in SSH .

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Private key settings for public-key authentication can be found in Global Settings | User Authentication | Keys in Settings dialog, as depicted in SSH Tectia documentation.

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Seems it can't work with .ppk files? –  user34701 Apr 20 '10 at 8:09
No, .ppk is Putty's own file format. When you generate your keys in Putty, use the Conversions | Export Openssh key to save a .key file to be used with other programs. Or you can load an existing key to PuttyGen as well and convert it. –  Jawa Apr 20 '10 at 8:38
Tectia's SSH.com probably uses the SSH.com format (though I wouldn't be surprised if it got OpenSSH key support too) –  grawity Apr 21 '10 at 18:46

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