Redhat NTPD Clock

[John Wirt]

Rick Stevens wrote:

>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
>
>  
>
I did this. Linux responded,

-bash : system-config-securitylevel: command not found

J Wirt

>>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 at vitalstream.com -
>>>- VitalStream, Inc.                       http://www.vitalstream.com -
>>>-                                                                    -
>>>-        Change is inevitable, except from a vending machine.        -
>>>----------------------------------------------------------------------
>>>
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>>> 
>>>
>>>      
>>>
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>>
>----------------------------------------------------------------------
>- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
>- VitalStream, Inc.                       http://www.vitalstream.com -
>-                                                                    -
>-                      LOOK OUT!!! BEHIND YOU!!!                     -
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>
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>  
>