accessing websites with cisco firewall

Just a general question looking for suggestions.   We have had some minor issues with accessing websites externally.  We use a cisco firewall that has been in place for about 5 years.  What will happen is non-NAT machines will not be able to access a certain website through the firewall it comes back unavailable.  Machines that are NAT addressed will access this site fine and the same non-NAT machines have no issues on other networks.   This only happens for maybe one out of 10000 websites we try to access.  I have no clue what it could be or even if it is on our side.  I am looking for suggestions as to where to start.
Tim LewisNetwork ManagerAsked:
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Robert Sutton JrSenior Network ManagerCommented:
Have you viewed the logs and see if your answer jumps out at you after an unsuccessful attempt?
Ernie BeekExpertCommented:
Agree, first check the logs. If you know any particular site that has this problem you can force an error and meanwhile check the logs.
Tim LewisNetwork ManagerAuthor Commented:
I see nothing in the logs that shows anything for my IP address or the IP of the site I am trying to access.
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Ernie BeekExpertCommented:
Ok, you talked about non-nat machines. Does that mean they use a public IP address?
Tim LewisNetwork ManagerAuthor Commented:
They are the ones without a public IP.  
Ernie BeekExpertCommented:
Ehr, let me first try to get the picture. You have natted and non-natted machines. Imho that would mean that some have private IPs and are natted through the firewall and others have public IPs and aren't natted.
Am I even close in this assumption?
Tim LewisNetwork ManagerAuthor Commented:
correct.  the non-NAT use the firewall IP for outside access when the NAT each have their own public IP
Well, NAT means Network Address Translation, in other words NATted machines' IP addresses are changed on the firewall. Non-NATed machines use public IPs
Ernie BeekExpertCommented:
So, those public ip's are 'yours' ?
Furthermore, what is the reason you have set things up this way (natted an non-natted)? And I agree with fgasimzade on the terminology for that matter :)
Robert Sutton JrSenior Network ManagerCommented:
Have you checked your DNS settings? J/C
Tim LewisNetwork ManagerAuthor Commented:
It seems to be on the other side.  Thanks

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Tim LewisNetwork ManagerAuthor Commented:
It is the only answer that is close.
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