[ntp:questions] The classic "no server suitable for synchronization found" error on my ntpd server.

Danny Mayer mayer at ntp.isc.org
Fri Apr 28 03:24:11 UTC 2006

Mike wrote:
> Whenever I try and sync time to my server, from a remote location
> (using ntpdate -u <myremotentpdservername> ), I always get the error
> "no server suitable for synchronization found".  My server is
> firewalled, but it is allowing TCP and UDP connection through port 123

Why is 123/TCP open? NTP doesn't use it. You should close that hole.

> I have the following in my ntp.conf file to allow for remote
> connections:
>   restrict mask nomodify notrap

What happened when you removed this and any other restrict statements?
You did do that didn't you?

>>From what I can tell, everything appears to be fine with the server.  I
> am also unable to sync the time on another computer on the same
> network, again, with no firewall interference.
> Where can I look for causes of this problem?

Start by removing restrictions first.


More information about the questions mailing list