ssh problems in buildfarm

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This is a continuation of this post. This is the error log from running lunar_rosdistro_cache job.

14:50:51 The command '/bin/sh -c python3 -u /tmp/wrapper_scripts/apt.py update-install-clean -q -y git python3-catkin-pkg-modules python3-rosdistro python3-yaml' returned a non-zero code: 100
14:50:51 Build step 'Execute shell' marked build as failure
14:50:51 SSH: Current build result is [FAILURE], not going to run.

I followed everything mentioned in the documentation. When I tried to test the connection in jenkins to the repo machine, the test configuration fails and sends me this error message.

Failed to connect or change directory
jenkins.plugins.publish_over.BapPublisherException: Failed to connect and initialize SSH connection. Message: [Failed to connect session for config [repo]. Message [Auth fail]]