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If the pipeline fails on connection timeout, check if the SSH key and the firewall rules are configured correctly. Check step 1 for the SSH setting, and here for firewall rules.
If you get an ‘invalid privatekey’ error while running the pipeline, check if the first line of your private key is:
'----BEGIN OPENSSH PRIVATE KEY-----'. If so, try generating a key pair with:ssh-keygen -m PEM -t rsa -b 4096
If connecting to the VM via SSH from the command line and a private key works, but the same setup results in an “Auth failed” exception from JSch, then verify that OS login is not enabled. From the Compute Engine UI, click “Metadata” from the menu on the left, and then click on the “Metadata” tab. Delete the “osLogin” kay or set it to “FALSE”.