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If receive a "Too many authentication failures" message such as:
Received disconnect from port 22:2: Too many authentication failures
you may have too many different ssh keys in your personal ssh configuration directory. Since the image does not have your key, try connecting with a password first using:
$ ssh -o PreferredAuthentications=password testuser@
If this works, you can customize your ssh configuration to specify either this option or options to use a specific key once you have added your keys.
More information on managing accounts, keys, and remote access can be found in the xref:user-guide.adoc[User Guide].