Re: [chrony-users] chrony messages not getting to server.

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

My home  firewall must be, since other remote systems work fine. 
How can I test whether it is open on the server? I assume telnet 123 uses tcp.
How do I send a udp packet to test whether it gets through?
The server is behind a university firewall. The claim is that that firewall
lets through udp on port 123. Mind you telnet S 123 gets through so that would
suggest that tcp gets through, if I am right that telnet uses tcp.



William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/

On Fri, 4 Mar 2022, Bryan Christianson wrote:

> [CAUTION: Non-UBC Email]
>
> NTP is a UDP protocol. Is your firewall open for UDP port 123 ?
>
> > On 4/03/2022, at 7:58 PM, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
> >
> > Note that I use other servers (eg a pool server) from my chrony on H, and they work fine
> > so again it does not seem to be a problem with the firewalls/routers between H
> > and the internet.
>
> NTP is a UDP protocol. Is your firewall open for UDP port 123 at both client and server?
>
> >
>
> Bryan Christianson
> bryan@xxxxxxxxxxxxx
>
>
>
>
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