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Cisco Pix 506e firewall blocking Win07 from accessing a specific website?

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CG IT

DNS server addresses are provided to clients as DNS options or are statically defined on the client machines.

If the DNS server does not have a record for the name and the address associated with the name, DNS will forward unresolved queries to root hint DNS servers. They the root hint servers don't resolve the name, the error is returned to the client in the browser as page and not be displayed.

you still haven't said where the web site is hosted. If it's hosted internally, then an internal DNS server should resolve the name to the correct address and send the query to the web server which then returns the web site in the users browser. If DNS does not resolve the name or if the users are using the incorrect DNS to resolve names, the user will get the page can not be displayed.