Hi Mike, <div>the servers have no software firewall (iptables is removed), we have a cisco pix firewall between our local zones and it is configured to allow ntp communications to/from the server hosting nagios and I haven't seen anything bounce on the logs.</div>
<div><br></div><div>The ntp server is on the same server I have nagios installed on and remote hosts have ntpd configured to allow everything from it.</div><div><br></div><div>The problem isn't limited to one host, I have been receiving "Offset unknown" statuses for different hosts at seemingly random rates today.</div>
<div><br></div><div>I can ntpq from the nagios server to "problematic" hosts and everything seems fine :</div><div><br></div><div><div>[root@nagios-server ~]# ntpq 555.555.555.555</div><div>ntpq> peers</div><div>
remote refid st t when poll reach delay offset jitter</div><div>==============================================================================</div><div> 666.666.666.666 777.777.777.777 2 u 18 64 17 0.248 38.592 27.076</div>
<div><br></div><div>IPs have been replaced:</div><div>555.xxx is the peer being checked</div><div>666.xxx is the server hosting nagios and the ntpd server</div><div>777.xxx is the remote ntp server we are using</div><br><div class="gmail_quote">
On Wed, Feb 17, 2010 at 10:52 AM, Michael Saldivar <span dir="ltr"><<a href="mailto:mike.saldivar@advocatecreditrepair.com">mike.saldivar@advocatecreditrepair.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div></div><div class="h5"><div class="gmail_quote">On Wed, Feb 17, 2010 at 5:55 AM, Elie Delorme <span dir="ltr"><<a href="mailto:elie@at-m.ca" target="_blank">elie@at-m.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex">
<div>All servers I poll have the same ntp configuration, it looks like the plugin can't handle some offsets,</div><div>most of the time everything is fine, then I randomly get an "Offset unknown" for a server.</div>
<div><br></div><div>I found a couple references to a bug involving a leap second, but they were also saying that it should be corrected</div><div>in 1.4.12.</div><div><br></div><div>I have tried restarting the ntp service a couple times but it did not help a bit.</div>
<div>I also checked with ntpq and everything seems fine.</div><div><br></div><div>My version is 1.4.14 ( latest available on sourceforge):</div><div># /usr/local/nagios/libexec/check_ntp_time --help</div><div>check_ntp_time v1.4.14 (nagios-plugins 1.4.14)</div>
<div>Copyright (c) 2006 Sean Finney</div><div>Copyright (c) 2006-2008 Nagios Plugin Development Team</div><div> <<a href="mailto:nagiosplug-devel@lists.sourceforge.net" target="_blank">nagiosplug-devel@lists.sourceforge.net</a>></div>
<div><br></div><div>Here is the output I get when executing the plugin from the command line:</div><div># /usr/local/nagios/libexec/check_ntp_time -v -H xxx.xxx.xxx.xxx</div><div>sending request to peer 0</div><div>response from peer 0: offset -0.01565231133</div>
<div>sending request to peer 0</div><div>response from peer 0: offset -0.01617310685</div><div>sending request to peer 0</div><div>response from peer 0: offset -0.01564534893</div><div>sending request to peer 0</div><div>
response from peer 0: offset -0.01622254931</div><div>discarding peer 0: stratum=0</div><div>overall average offset: 0</div><div>NTP CRITICAL: Offset unknown|<br>
</div></blockquote></div><br></div></div>Have you checked the full time and date on these machines to make sure that they are actually correct? Do they have a firewall rule blocking external NTP calls?<br><br>-Mike<br>
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