ntpd error

[John DeDourek]

Vivek J. Patankar wrote:
> Manuel Arostegui Ramirez wrote:
>> El Domingo, 20 de Mayo de 2007 03:01, Lux Zhang escribió:
>>> Hi
>>> I tried to used ntpd to sync time, but always got a failure error:
>>>
>>> [root at home]# /sbin/service ntpd restart
>>> Shutting down ntpd:                                        [  OK  ]
>>> ntpd: Synchronizing with time server:                      [FAILED]
>>> Starting ntpd:                                             [  OK  ]
>>>
>>> how to fix this?
>>
>> Some kind of firewall blocking that connection?
>>
>
> Keep in mind that you need to open port 123 TCP & UDP for it to work. 
> I was having problems with time synchronization in servers in a DMZ 
> and opening just 123 TCP didn't work.
>
In fact, ntp normally uses UDP port 123.  The last time I looked,
it did NOT use TCP port 123 at all.  Therefore, I suggest that you
should NOT open TCP port 123.