View source for Pflogd

  # ps auwx | grep pflog
    root          19229  0.0  0.3  5016  1432  ??  Is   10:56AM   0:00.01 pflogd: [priv] (pflogd)
 _pflogd       19230  0.0  0.3  5080  1464  ??  S    10:56AM   0:00.06 pflogd: [suspended] -s 116 -f /var/log/pflog (pflogd)

As you can see, I had pflogd suspended for some reason.

from pflogd(8):

     pflogd tries to preserve the integrity of the log file against I/O
     errors.  Furthermore, integrity of an existing log file is verified
     before appending.  If there is an invalid log file or an I/O error, log-
     ging is suspended until a SIGHUP or a SIGALRM is received.


I tried 

   # pkill -HUP pflogd

but no luck, it was still suspended. 

  # /etc/rc.d/pflog stop
  # mv /var/log/pflog /var/log/pflog.fscked
  # touch /var/log/pflog
  # chmod 600 /var/log/pflog
  # /etc/rc.d/pflog start

and I was back in the running:
 # ps auwx | grep pflog
 root          19406  0.0  0.3  5016  1432  ??  Is   11:07AM   0:00.01 pflogd: [priv] (pflogd)
 _pflogd       19407  0.0  0.3  5080  1456  ??  S    11:07AM   0:00.03 pflogd: [running] -s 116 -f /var/log/pflog (pflogd)