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Today, I am suddenly getting the untrusted website error for all Google websites, but not for any other. Internet Explorer gives no such error. Reboot of this Windows 7 computer does not help.

Is this some kind of virus infection that is hijacking DNS resolution away from Google to some spoofer?

How can I resolve this issue and get Google websites working again normally?

If I manually enter a Google IP Address, the page loads correctly.

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Did you determine that google IP by normal DNS resolution from your machine? Do you have a tool to check what outgoing connections Firefox makes? – Jonas Heidelberg Feb 7 '12 at 21:40
No, I used yahoo to search for an ip address posted on a website. But I also tried doing ping from DOS prompt and tried that address too and it worked fine. What tool allows you to check the outgoing connections from Firefox? – WilliamKF Feb 7 '12 at 21:43
do you or your office have a proxy server? – horatio Feb 7 '12 at 22:17
I'm using VPN at all times, but now the issue has mysteriously gone away. – WilliamKF Feb 7 '12 at 22:31
up vote 1 down vote accepted

Another possible reason is an incorrect date (year, for example) on the computer. So browser considers SSL certificates expired or not yet valid.

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this would make sense if was occurring in both browsers perhaps but the OP claims it only occurs in Firefox – Mark S. Feb 12 '12 at 15:33

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