Converting PuTTY private keys to OpenSSH format


This article will describe why Upsource doens't accept private keys generated in PuTTY and what to do in such cases.



When creating a new project in Upsource, you get to choose one of the following authentication methods to access your VCS: Anonymous, Password or SSH key. In case of SSH key, private key and passphrase(if any) should be provided. After that, while testing connection you might get the following error:

Test VCS connection failed.

List remote refs failed: com.jcraft.jsch.JSchException: Error while loading an uploaded key 'the-key': invalid privatekey



Most likely your public/private key pair was generated via PuTTYgen. Upsource doesn't work with PuTTY-format private keys, so you would need to convert it to OpenSSH format. To do that, please perform the following steps:

  1. Open PuttyGen
  2. Click File -> Load private key
  3. Go to Conversions -> Export OpenSSH and export your private key
  4. Try to paste converted private key to Upsource




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