Able to Connect to Webpage with Proxy, but Unable Without

Hi there. Quick question. Why am I able to access a website through a proxy, but am unable to access it without one?

I'm trying to access, but Mozilla says it's unable to connect. I've had this problem for more than a year I believe. I thought it would resolve itself, but it isn't. Linkedin is a huge website so I am actually very surprised I'm having this problem. Proxy works fine, but I'm a bit worried about putting in my credentials over a proxy connection.

My phone on WiFI is also unable to connect to Linkedin. However, I don't have a data connection on my phone so can't confirm through my cellular provider.

Other websites give me the same problem from time to time, but Linkedin is real problem for me.

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Clarification Request
Check for browser proxy server settings

It looks like your browser is accessing the Internet through a proxy server. Does the browser you use to access the Internet have a proxy server listed in the settings? This will give me an idea of whether or not your computer is accessing the Internet through a proxy server. The settings should be under Windows settings. For Internet Explorer/Edge or Chrome, this should be the case.

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Re: can't connect to Linkedin

If Firefox can't and your phone can't, it's likely that other browsers on your PC can't either. Can you check that with Internet Explorer and Edge (if your PC has Windows 10)?
Also, if you have a friend with a laptop, what happens if he tries with you?

For a first diagnostic, go into the command prompt and type
ping (+ enter key)
Copy/paste the output to your answer here. If you don't know how to copy/paste from the command window, either google that or just type that few lines.

Post was last edited on August 1, 2017 2:05 AM PDT

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I see no OS, details.

All I can write is the usual is a trojan, DNS hijack or bad DNS. No OS, details mean we can't start with specific ideas.

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