...
- Tailing the ssh server's /var/log/auth.log file while re-trying the failing ssh command.
- Use ssh's -v option. It can be used up to three times for greater verbosity.
Specific auth.log error messages
- sshd[*]: User * not allowed because account is locked: Commonly caused by /etc/shadow having "!!" in the password field, in which case it can be worked around by setting a password. Further causes are documented in the sshd man page in the AUTHENTICATION section.
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