Puttygen unable to use key file

When you try to use a private key to connect to a box using SSH2. You may get the following error "Unable to use key file "xxx" (OpenSSH SSH-2 private key)".To do that, open your PuttyGen, go to the Conversion - "Import key". Then after you load your OpenSSH private key, you can click on "Save private key" and it will create a new private key specifically for Putty with extension .ppk (Putty Private Key file). Then, you can load the key by open up Putty - Connection - SSH - Auth and browse for "Private key file authentication:". I hope this help with your issue.

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