Internet access - seems blocked at 1st level

I am having problems accessing the Net - I am using a LAN connection. I get into Google (most times) and even get results when I search - but as soon as as I try to go into the pages, it says I am not connected. The same with the Apple site - I get the landing page, but as soon as I try to get into any link, it says I am not connected - there seems to be some setting preventing me from a first level of surfing ??? PPPPPLEASE help

For later versions (Adobe CC and onwards) you need to block port 443 as well as port 80.

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