Windows machines can’t access or AV-sites from my network

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Please excuse me if this question is off-topic.

None of the Windows machines(1*Vista, 1*Win7, 1*Win8) on my network can access or AV-sites unless I set as DNS-server. The strange thing with this is that Androids, iOS and Linux devices can access these sites. I tried taking the Win7 laptop to another network (same ISP), and there it managed to access

I cannot find anything useful on my Thomson TG784 Gateway.

This is a mystery.


You can use this website to check if you have been infected by Conficker :


Conficker (aka Downadup, Kido) is known to block access to over 100
anti-virus and security websites.

If you are blocked from loading the remote images in the first row of
the top table above (AV/security sites) but not blocked from loading
the images in the second row (websites of alternative operating
systems) then your Windows PC may be infected by Conficker (or some
other malicious software).

If you can see all six images in both rows of the top table, you are
either not infected by Conficker, or you may be using a proxy server,
in which case you will not be able to use this test to make an
accurate determination, since Conficker will be unable to block you
from viewing the AV/security sites.

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