On Ubuntu 14.04 sshguard fails to start when a blacklist is attempted (-b file). The code must exit errors with "0" (?) since there is not record of failure in auth.log -- just no mention of (re)start! I can't see any recent mails in the archives, so assume that this is no longer supported?
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This is embarrassing -- I updated the wrong ticket. Oops.
Not enough information to work on this. If this problem persists with the latest release and you are able to provide steps to reproduce the problem, please re-open this issue.