Unable to connect to internet outside of LAN using a pc on the domain

NOTE: We use static IP addresses on both our LAN and DMZ

Computer A is joined to our domain and is connected to our LAN, - internet works correctly.
Computer A is joined to our domain and is connected to our DMZ (IP address changed accordingly) - internet does not work
Computer A is joined to our domain and is connected to a 3G air card (IP address set to automatic) - internet does not work.

Computer B is a member of a workgroup and is connected to our LAN - internet works correctly.
Computer B is a member of a workgroup and is connected to our DMZ - internet works correctly.
Computer B is a member of a workgroup and is connected to a 3G air card - internet works correctly.

It would seem to me that there is something in the domain is preventing an alternate connection to the internet. Could this be a GPO, or route setting?
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tgarrityAsked:
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brwwigginsIT ManagerCommented:
do a route print from the command line and look for persistent routes. You can remove them from the command line as well with the route delete command
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Hypercat (Deb)Commented:
I would look at GPO first. Look at the Windows Firewall and/or Windows Firewall with Advanced Security settings in any GPO that applies to this computer and/or user.
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jbincsCommented:
flush the dns cache. check the IP, firewall security settings, and proxy settings (using?)
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tgarrityAuthor Commented:
Windows firewall is disabled via GPO. We are not using a proxy.
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Hypercat (Deb)Commented:
This may seem like a silly question, but when you changed the IP address for Computer A to move it to the DMZ, did you change the default gateway as well? How about DNS? Can you ping/connect to other computers in the DMZ as opposed to hosts on the Internet, or is there no connectivity at all when in the DMZ?

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tgarrityAuthor Commented:
yes IP address, gateway, and DNS are changed when connecting to DMZ.
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brwwigginsIT ManagerCommented:
If the computer is in a DMZ are you sure the computer can connect back to a DC to apply the GPO?

If you tracert to some known internet host (such as 8.8.8.8) when in the DMZ what are the results?
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tgarrityAuthor Commented:
If I were to log on to our DMZ on a laptop that is a member of the domain as a local administrator, the internet does not connect. I think it has to do with a persistent route that was setup in the registry. I'm just not sure how it got there.
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tgarrityAuthor Commented:
Thank you
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