I have the very same issue unter Lucid (10.04.3), i.e. starting knockd just leads to the two entries in the log, and that's it. However, changing the start script to upstart does not help...
I have the very same issue unter Lucid (10.04.3), i.e. starting knockd just leads to the two entries in the log, and that's it. However, changing the start script to upstart does not help...