Re: Can't get ntp to work

[David Magda]

> On Oct 18, 2015, at 08:03, Marcin Wisnicki  
> wrote:
> 
> My ntpd stopped synchronizing clock sometime ago (default ntp.conf).
> 
> To debug the problem I've tried running ntpdate and got strange results:
> 
>> # ntpdate 0.freebsd.pool.ntp.org
>> 18 Oct 13:53:14 ntpdate[55102]: no server suitable for synchronization found
>>  
>> # ntpdate -u 0.freebsd.pool.ntp.org
>> 18 Oct 13:53:19 ntpdate[55119]: adjust time server 193.25.222.240 offset 
>> 0.002672 sec
> 
> 
> This would point to broken firewall BUT:
> 
>> # nmap -p123 -sU 0.freebsd.pool.ntp.org
>> 
>> Starting Nmap 6.49BETA5 ( https://nmap.org ) at 2015-10-18 13:52 CEST
>> Nmap scan report for 0.freebsd.pool.ntp.org (193.25.222.240)
>> Host is up (0.027s latency).
>> Other addresses for 0.freebsd.pool.ntp.org (not scanned): 94.154.96.7 
>> 95.158.95.123 46.175.224.7
>> rDNS record for 193.25.222.240: afrodyta.complex.net.pl
>> PORTSTATE SERVICE
>> 123/udp open  ntp
>> 
>> Nmap done: 1 IP address (1 host up) scanned in 0.64 seconds
> 
> So there is nothing blocking the traffic.
> 
> Any ideas ?

Both “nmap" and “ntpdate -u” would use an unprivileged, ephemeral port, while 
ntpd(8) and a regular run of ntpdate(8) would use UDP 123 as the source port. 
Perhaps there is a firewall issue with source ports lower than 1024?

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Can't get ntp to work

[Marcin Wisnicki]

My ntpd stopped synchronizing clock sometime ago (default ntp.conf).

To debug the problem I've tried running ntpdate and got strange results:

> # ntpdate 0.freebsd.pool.ntp.org
> 18 Oct 13:53:14 ntpdate[55102]: no server suitable for synchronization found
>   
> # ntpdate -u 0.freebsd.pool.ntp.org
> 18 Oct 13:53:19 ntpdate[55119]: adjust time server 193.25.222.240 offset 
> 0.002672 sec


This would point to broken firewall BUT:

> # nmap -p123 -sU 0.freebsd.pool.ntp.org
> 
> Starting Nmap 6.49BETA5 ( https://nmap.org ) at 2015-10-18 13:52 CEST
> Nmap scan report for 0.freebsd.pool.ntp.org (193.25.222.240)
> Host is up (0.027s latency).
> Other addresses for 0.freebsd.pool.ntp.org (not scanned): 94.154.96.7 
> 95.158.95.123 46.175.224.7
> rDNS record for 193.25.222.240: afrodyta.complex.net.pl
> PORTSTATE SERVICE
> 123/udp open  ntp
> 
> Nmap done: 1 IP address (1 host up) scanned in 0.64 seconds

So there is nothing blocking the traffic.

Any ideas ?

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