Like its author, Nmap isn't perfect. But you can help make
it better by sending bug reports or even writing patches. If Nmap
doesn't behave the way you expect, first upgrade to the latest
version available from https://nmap.org. If the problem persists,
do some research to determine whether it has already been
discovered and addressed. Try searching for the error message on our search page at http://insecure.org/search.html or at Google. Also try
browsing the nmap-dev archives at http://seclists.org/.
Read this full manual page as
well. If nothing comes of this, mail a bug report to
<firstname.lastname@example.org>. Please include everything
you have learned about the problem, as well as what version of
Nmap you are running and what operating system version it is
running on. Problem reports and Nmap usage questions sent to
<email@example.com> are far more likely to be answered than
those sent to Fyodor directly. If you subscribe to the nmap-dev
list before posting, your message will bypass moderation and get
through more quickly. Subscribe at https://nmap.org/mailman/listinfo/dev.
Code patches to fix bugs are even better than bug reports.
Basic instructions for creating patch files with your changes are
available at https://svn.nmap.org/nmap/HACKING. Patches may
be sent to nmap-dev (recommended) or to Fyodor directly.