NTP server.

Unanswered Question
Jul 13th, 2009


i want to create NTP server on ASA 5540 firewall, its work to synchronize to all my devise in network.

and if yes then tell me how i installed it on my asa.

I have this problem too.
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srue Mon, 07/13/2009 - 09:25

ASA's cannot be NTP servers, only NTP clients.

mitang.prajapati Mon, 07/13/2009 - 10:27

ok then tell me what command i give to configure my ntp client i have windows ntp server.

srue Mon, 07/13/2009 - 10:34

on the asa:

asa(config)# ntp server x.x.x.x

srue Mon, 07/13/2009 - 10:45

use the "clock timezone" command to set the timezone. use "clock summertime" if you use daylight savings.

mitang.prajapati Mon, 07/13/2009 - 10:55

i had give this command

ntp server x.x.x.x

but after this its not synchronize with time.

now what i do ?

mitang.prajapati Mon, 07/13/2009 - 11:09

its shown me wrong time so what i do ?

and how i check that time is properly synchronize?

srue Mon, 07/13/2009 - 11:33

show ntp status

show clock

if it's not working, debug ntp.

can you ping the ntp server from the asa?

mitang.prajapati Mon, 07/13/2009 - 11:54


i ping that server.but i got time differnce between server and asa. its around 5min.

robertson.michael Tue, 07/14/2009 - 06:23

Hi Mitang,

I had a similar issue at one point in the past--the ASA was not syncing properly with a Windows 2003 NTP server. I believe the ASA was reporting the NTP server as having a status of "insane".

I am not 100% positive, but I believe these are the instructions I followed to resolve this issue. Take a look at the section called "Configuring the Windows Time service to use an internal hardware clock":


Hope that helps.



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