An incompatible change was made to the NTS protocol in version 26 of the draft (https://tools.ietf.org/html/draft-ietf-ntp-using-nts-for-ntp-26). This means that old NTS clients following the behaviour before version 26 will not work with servers following the new behaviour since version 26.
To make this change as painless as possible for existing users, the Netnod NTS servers will keep supporting the old behaviour on TCP port 4443, just as before. This means that those using old clients will not have to do anything.
Netnod's NTS servers will also support the new behaviour as well, but on a different TCP port, 3443. If you have an existing NTS client and upgrade it to the new behaviour, or if you install a NTS client using the new behaviour, make sure that it uses port 3443 and not port 4443.
More information about Netnod’s NTS service is available here.
Netnod provides critical infrastructure support ranging from interconnection services and Internet Exchanges to DNS services, root server operations and activities for the good of the Internet. With a worldwide reputation for its services and the expertise of its staff, Netnod ensures a stable and secure Internet for the Nordics and beyond. Established in 1996 as a neutral and independent Internet infrastructure organisation, Netnod is fully owned by the non-profit foundation TU-stiftelsen (Stiftelsen för Telematikens utveckling). More information is available at: www.netnod.se
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