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[ChristianEhrhardt <1684304@xxxxxxxxxxxxxxxxxx>]

Confirmed: Fixed in Zesty, still broken in Yakkety

** Also affects: nmap (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: nmap (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: nmap (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1684304

Title:
  nmap man page lacks port state headlines

Status in nmap package in Ubuntu:
  Fix Released
Status in nmap source package in Xenial:
  Confirmed
Status in nmap source package in Yakkety:
  Confirmed

Bug description:
  Something is wrong with rendering of the intended headlines of port
  states in chapter PORT SCANNING BASICS.

  Viewing using man/info yields this where text is confusingly referring
  to missing state categories:

  
         The six port states recognized by Nmap

             An application is actively accepting TCP connections, UDP datagrams or SCTP associations on
             this port. Finding these is often the primary goal of port scanning. Security-minded people
             know that each open port is an avenue for attack. Attackers and pen-testers want to exploit
             the open ports, while administrators try to close or protect them with firewalls without
             thwarting legitimate users. Open ports are also interesting for non-security scans because
             they show services available for use on the network.

             A closed port is accessible (it receives and responds to Nmap probe packets), but there is
             no application listening on it. They can be helpful in showing that a host is up on an IP
             address (host discovery, or ping scanning), and as part of OS detection. Because closed
             ports are reachable, it may be worth scanning later in case some open up. Administrators may
             want to consider blocking such ports with a firewall. Then they would appear in the filtered
             state, discussed next.

  Looking in the unrendered file show the intended headline
  (/usr/share/man/man1/nmap.1.gz):

  
  \fBThe six port states recognized by Nmap\fR
  .PP
  .\" open port state open
  .RS 4
  An application is actively accepting TCP connections, UDP datagrams or SCTP associations on this port\&. F
  inding these is often the primary goal of port scanning\&. Security\-minded people know that each open por
  t is an avenue for attack\&. Attackers and pen\-testers want to exploit the open ports, while administrato
  rs try to close or protect them with firewalls without thwarting legitimate users\&. Open ports are also i
  nteresting for non\-security scans because they show services available for use on the network\&.
  .RE
  .PP
  .\" closed port state closed
  .RS 4
  A closed port is accessible (it receives and responds to Nmap probe packets), but there is no application 
  listening on it\&. They can be helpful in showing that a host is up on an IP address (host discovery, or p
  ing scanning), and as part of OS detection\&. Because closed ports are reachable, it may be worth scanning
   later in case some open up\&. Administrators may want to consider blocking such ports with a firewall\&. 
  Then they would appear in the filtered state, discussed next\&.
  .RE
  .PP

  Other sections look like they have the same problem.

  I am not enough familiar with groff to know what the tag .\" should
  do, it might look like it is a comment by the file header.
  Nevertheless, the states are clearly missing from context so they
  should be present one way or the other.

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 16.04.2 LTS
  Release:	16.04
  Codename:	xenial

  $ apt-cache policy nmap
  nmap:
    Installed: 7.01-2ubuntu2
    Candidate: 7.01-2ubuntu2
    Version table:
   *** 7.01-2ubuntu2 500
          500 http://dk.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

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