Denyhosts is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is SSHGuard, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 10 alternatives to Denyhosts, but unfortunately only two of them are available for Mac. If you can't find an alternative you can try to remove all filters.
SSHGuard monitors services through their logging activity. It reacts to messages about dangerous activity by blocking the source address with the local firewall. SSHGuard employs a clever parser that can transparently recognize several logging formats at once (syslog, syslog-ng...
