[ntp:questions] Is it possible to run ntpd server behind a firewall?

Danny Mayer mayer at ntp.isc.org
Wed Oct 17 02:36:12 UTC 2007

Shaochun Wang wrote:
> The stupid net administrator of my institute blocked all UDP datagram
> in the firewall. I know that NTP uses UDP to do its work, but is it
> possible to let ntpd use TCP?

No.  You cannot "let" ntpd use TCP. NTP is a UDP-only protocol. Talk to
your net admin. Maybe he can set up a NTP server on the firewall.


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