I have found out that Cups can't find Printer Samsung-CLX-3170 Default.
Running a Print Job it say it is " Data file sent successfully".
So the print job is sent but cups Debug has "can't find a Printer"
And I haven't the slightest on how to troubleshoot the problem.
Network printer setup lpd://192.168.1.127/PASSTHRU .
I can ping 192.168.1.127 and get no dropped packets.
I can do a http://192.168.1.127
and get into the Printer Setting.