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Jenkins invalid privatekey

Publish over SSH, Message "invalid privatekey:"

With quite recent (June-July 2020) installations of Jenkins and OpenSSH, I have the following error message when using the "Deploy overs SSH" Jenkins plug-in and publishing artifacts to the target overs SSH: 
jenkins.plugins.publish_over.BapPublisherException: Failed to add SSH key. Message [invalid privatekey: [B@d8d395a]
This problem seems to be referenced here: https://issues.jenkins-ci.org/browse/JENKINS-57495

Just regenerate a key with the right parameters

To solve it: 
ssh-keygen -t rsa -b 4096
Or 
ssh-keygen -t rsa -b 4096 -m PEM
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