title: Trouble shooting
Make sure all horizons are operational
  -blackhole-control status
  -blackhole-control statuserr
blackhole-control status
  -reports the horizons connected
  -the last error encountered by each horizons
  -connection rules with statistics (count, last usage date)
Horizon NAME fd=9 nbretry=0 nbping=0 is_far=0 since=2015/02/17-14:19:26 lasterror=
  -fd=X: File handle of the socket or -1 if not connected
  -nbretry=How many time we tried to connect to this horizon 
  -nbping=How many unanswered pings
  -is_far=Is there a closer blackhole for this horizon
  -since=When the connection was done
  -lasterror=Last error message produced by the horizon
Check <b>/var/log/messages</b> on the horizons