Unresolved problem with multiple networks and no internet

I have a windows 7 box with 2 tcp/ip network cards, both rj45 wired.  One to our internal router with a static ip and internal dns and no gateway.  the other to our external router with the external static ip and the router address as gateway with isp DNS settings.

Network connections shows the box connected to multiple networks and an "X"' connection to the internet.

Our domain network shows as does the public nietwork, but with no internet connection

I can connect to the internet with this box through our ISA proxy, but need to use the second direct outside connection for some ftp/edi software we have no control over.

All the answers I have seen here or anywhere else alude to "BONJOUR" or wireless as the cause for the problem.  NEITHER exist on this machine.

I am sure it is simply a setting I cannot find somewhere but need help in identifing where.

here are the two simulated settings for the cards ( numbers changed to protect the guilty :-)

Domain network card

IP          static domain ip

dns1     domain server
dns2       secondary domain server (WSUS)

Internet network card

IP           static router ip
gate         static router

dns1       isp dns
dns2       isp secondary dns
These settings worked on windows xp,. server 2000, server 2003,  why not on 7??

Help please
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MereteConnect With a Mentor Commented:
Hi Briancslnet
Just to throw some ideas your way as this is really out of my experience range, that is >
.>  2 tcp/ip network cards

First windows 7 uses 128 bit encryption, may or may not effect this, maybe windows cannot determin the two adapters.
Since you can see shared folders right??
 it must be down to the router and how these computers are connected to the router.
Obviously the router does not identify with the DNS address internal? and or the ip address.
Are the systems connected all administrators?
What is the anti virus software?
Which computers do you see in the router?
All computers using the same workgroup?
Ok enough my questions

r/click the network icon on the taskbar then open network sharing center
on the right panel open advanced sharing settings,
turn off network discovery

have you also looked into switching off the firewall temporary?
Have you tried running the windows 7 network  troubleshoot problems?
And it's only the internet?

Here is a similar problem is it yours as it seems exactly the same


BriancslnetAuthor Commented:
By turning off auto discovery and running some diagnostic tools we were able to find out that the problem was a partially defective interface card.

Good advice to anyone else with this or a similar problem.
"Check for hardware problem first".
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