DenyHosts exits without producing any output, what happened?
Since DenyHosts is intended to run from cron, by default it therefor tries to minimize output. In general, only error conditions are output. However, if you’d like to see more details of what it’s doing, you can supply the –verbose flag on the command line. Alternatively, if you’d like to see all of the gory details of what DenyHosts is doing, you can invoke DenyHosts with the –debug flag. It is recommened, when reporting a bug that you supply the output from running DenyHosts with the –debug flag.