Maven site deploy authentication error with scp

I get Auth fail error when running mvn -X site:deploy.

org.apache.maven.wagon.authentication.AuthenticationException: Cannot connect. Reason: A开发者_如何学Gouth fail

It seems that the correct private key is used and I can scp files normally to the project site directory using scp on Ubuntu.

What can be causing this?

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I found out that I forgot to specify the passphrase for my private key.