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GeologyETH

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Cannot view http, but https pages on Mountain Lion with Safari and Firefox

Dear managers,

On all accounts on the Mac, Safari and Firefox installed on OS X 10.8.5 cannot view http, but https pages. A http pages remains empty or tells that it's not accessible.
There's no proxy used, the behavior is the same whether using lan or wlan, i.e. different router.
I've found https://discussions.apple.com/thread/3900989 which doesn't help.

TIA.
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Eoin OSullivan
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Was it working before and suddenly stopped working?

Are you on a desktop or laptop? Ethernet or WiFi? Home, work, public network?
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GeologyETH

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The problem started some days ago. It's an iMac on both Ethernet and  WIFI at work.
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Eoin OSullivan
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Parental Controls is disabled and I check the firewall + disabled AVG LinkScanner, but not Sophos. I'll check + create a new account as you suggested + let you know.
Have you tried in different locations? In other words, is this a problem only on your home network? If your Mac is a laptop, try connecting at a local Starbucks and see if it works. If it does, the problem may be in your router.
Also, check your DNS settings in the advanced tab of the network prefs.
I finally found it. Although I thought I had checked the security software, Sophos has Web Protection which I didn't realize. Disabling the web protection enables again to view http web pages. Thanks for your help.