 | | | Redhat NTPD Clock | Redhat NTPD Clock 2006-05-26 - By Rick Stevens
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On Thu, 2006-05-25 at 21:26 -0400, John Wirt wrote:
> Hmm..can you tell me how to set the security level?
>
> Thank you, Rick.
Become the root user:
$ su -
(enter root's password here)
>From there (assuming RHEL 3, RHEL4 or FC2-5), run:
# system-config-securitylevel
>
> John Wirt
>
>
>
> Rick Stevens wrote:
>
> >On Thu, 2006-05-25 at 00:58 -0400, John Wirt wrote:
> >
> >
> >>Thanks you several of you, I have RedHat booting to completion just fine
> >>except for one problem.
> >>
> >>Near the end of the boot sequence, RedHat apparently tries to connect to
> >>some time standard at 66.187.224.4. The sequence is:
> >>
> >>
> >> ntpd: Opening firewall for input from 66.187.224.4 port 123
> >> ntpd: Opening firewall for input from clock.redhat.com port 123
> >> iptables v 1.2.8: host/network clock.redhat.com not found [FAILED]
> >>
> >> use iptables -h for assistance.
> >>
> >>However, iptables -h doesn't provide any help.
> >>
> >>What is the problem? How can I fix it?
> >>
> >>
> >
> >You must have the firewall open ports for TCP and UDP port 53 (DNS).
> >What's probably happening is that the system is trying to resolve
> >clock.redhat.com (66.187.224.4 and 66.187.233.4) and can't because the
> >firewall is blocking DNS issues. This happens if you used the "maximum"
> >setting on system-config-securitylevel as that blocks EVERYTHING
> >(including DNS). Use the "medium" security setting.
> >
> >-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
> >- Rick Stevens, Senior Systems Engineer rstevens@(protected) -
> >- VitalStream, Inc. http://www.vitalstream.com -
> >- -
> >- Change is inevitable, except from a vending machine. -
> >-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
> >
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- VitalStream, Inc. http://www.vitalstream.com -
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