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Unable to Use Key File OpenSSH SSH-2 Private Key (Old PEM Format)

July 23, 2024
in A, Blog, PuTTY
0
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Table of Contents

Unable to Use Key File OpenSSH SSH-2 Private Key

In some cases, you get the following error when trying to connect to a Linux system using PuTTY with private key authentication.

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You got this because you use a private key with OpenSSH format. To fix it, you need to convert the OpenSSH private key to PuTTY format.

1. Visit the PuTTY official website then download the PuTTYGen.

Download: https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html

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2. Open the downloaded file to run the PuTTY Key Generator.

3. Go to Conversions | Import key.

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4. Browse then select the OpenSSH private key.

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5. The private key is converted to PuTTY format. Click on the Save private key button to save it to a file.

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6. Save the file to a safe location. As you can see, the PuTTY private key format is .ppk.

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Finally, open PuTTY, change the private key authentication from OpenSSH format to the PuTTY format then trying to connect to a remote Linux system.

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The connection should be established without any issue.

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