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.

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

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1. NTP Support Web

This is a web-based collaboration area for Community Supported Documentation for the reference implementation of NTP from www.ntp.org. Please see the Dev Web for NTP Development.

The main starting points in this Web are:

• Quick Start
• Installation
• Configuration
• Operation
• Troubleshooting
• FAQ
• Background
• Index

A list of the main sections of this Web is available in the menu on the left side of every page

1.1. Terms and Conditions

Use of the NTP Public Services Project web-site indicates your agreement with, and acceptance of, the PrivacyPolicy, the TWikiDisclaimer, and, if applicable, the PrivateWebPolicy.

1.2. Information for new users

First time visitors should visit the User Web to learn more about the NTP TWiki and for member registration.

• New NTP users should read the Where-To-Start file included with the NTP distribution.
• Documentation for the current NTP distribution, along with additional information, is available on the documentation page.
• Community supported documentation is available in the Support Web of this site.
• NTP users who don't like to read documentation may want to refer to a QuickStart Guide.
• If you would like to find a server to get time from, please see the public NTP server list.
• If you would like to download NTP software please see the download page.
• If you would like to locate NTP software other than the reference distribution, please see the links page.

1.3. Other starting points for NTP Solutions

• Refer to the Official NTP Documentation
• Refer to the NTP FAQ
• Ask on irc://irc.freenode.net/#ntp, and use https://www.pastebin.org (or https://www.sourcecode.no/pastebin/en/) if you need to show folks config files or log file excerpts.
• Search for a solution to a problem using WebSearch.
• Use the WebIndex or WebTopicList to see the current list of topics in the Support Web.

1.4. Useful Links

• BlackLists used by the ntp.org mail-server
• Issue Tracking for Bug Reports and Enhancement Requests
• ClockLinks to NTP-related resources
• NTP Project Web-Site
• Time Server Lists
• VendorLinks to NTP-related hardware/software vendors

Notes:

• You are currently in the Support web. The color code for this web is this background, so you know where you are.
• If you are not familiar with the NTP collaboration platform, please visit WelcomeGuest first.

New TWiki users should ReadMeFirst The TWiki TM home is https://TWiki.org/