Jenkins is running under user account X which has permissions and trusts our destination (in its knownhosts file). Using the command line, we are able to SSH/SCP/etc. to our destination host with that account but when attempting to orchestrate exactly the same connection via the Jenkins Publish over SSH plugin, we receive the error:

jenkins.plugins.publish_over.BapPublisherException: Failed to connect session for config [BETA Unix Server]. Message [Auth cancel]

I note that the failed login count on the destination increases.

We are not using public/private key here, just password but as mentioned, it works perfectly when performed manually on the cmd line.

Please could someone help us ascertain whether this is a bug or a problem with our setup?