A lot of distributions moved from the old nc to nmap-ncat which has a different meaning for the -d or -w options.
Created attachment 14037 [details]
patch for 4.8
This is ready for 4.8.
(In reply to Amitay Isaacs from comment #2)
Pushed to autobuild-v4-8-test.
(In reply to Karolin Seeger from comment #3)
Pushed to v4-8-test.
Closing out bug report.