r13 - 2011-01-04 - 04:09:30 - SteveKosteckeYou are here: NTP >  Main Web > SoftwareDownloads > ChangesStable
NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.

ntp-4.2.8p15 was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.

Please see the NTP Security Notice for vulnerability and mitigation details.

Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

Stable Release NEWS

NTP 4.2.6p3 (Harlan Stenn, 2011/01/03)

Focus: Bug fixes and portability improvements

Severity: Medium

This is a recommended upgrade.

This release includes build infrastructure updates, code clean-ups, minor bug fixes, fixes for a number of minor ref-clock issues, and documentation revisions.

Portability improvements in this release affect AIX, Atari FreeMiNT, FreeBSD4, Linux and Microsoft Windows.

New features / changes in this release:

Build system

  • Use lsb_release to get information about Linux distributions
  • 'test' is in /usr/bin (instead of /bin) on some systems
  • Basic sanity checks for the ChangeLog file
  • Source certain build files with ./filename for systems without . in PATH
  • IRIX portability fix
  • Use a single copy of the "libopts" code
  • autogen/libopts upgrade
  • configure.ac m4 quoting cleanup


  • Do not bind to IN6_IFF_ANYCAST addresses
  • Log the reason for exiting under Windows
  • Multicast fixes for Windows
  • Interpolation fixes for Windows
  • IPv4 and IPv6 Multicast fixes
  • Manycast solicitation fixes and general repairs
  • JJY refclock cleanup
  • NMEA refclock improvements
  • Oncore debug message cleanup
  • Palisade refclock now builds under Linux
  • Give RAWDCF more baudrates
  • Support Truetime Satellite clocks under Windows
  • Support Arbiter 1093C Satellite clocks under Windows
  • Make sure that the "filegen" configuration command defaults to "enable"
  • Range-check the status codes (plus other cleanup) in the RIPE-NCC driver
  • Prohibit 'includefile' directive in remote configuration command
  • Fix 'nic' interface bindings
  • Fix the way we link with openssl if openssl is installed in the base system


  • Fix -V coredump
  • OpenSSL version display cleanup


  • Many counters should be treated as unsigned


  • Do not ignore replies with equal receive and transmit timestamps


  • libntpq warning cleanup


  • Correct SNMP type for "precision" and "resolution"
  • Update the MIB from the draft version to RFC-5907


  • Display timezone offset when showing time for sntp in the local timezone
  • Pay proper attention to RATE KoD packets
  • Fix a miscalculation of the offset
  • Properly parse empty lines in the key file
  • Logging cleanup
  • Use tv_usec correctly in set_time()
  • Documentation cleanup

more Complete NEWS file
more Complete Change Log

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