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2 responses
                        
                    in firefox 58, if you go to about:config in your browser and search for the network.proxy.proxy_over_tls entry and click it to make it false, it fixes it.
                
                
            
                
        
                    xpcman
    
        
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Jul 21, 2017 at 04:16 PM
    Jul 21, 2017 at 04:16 PM
                        
                    You probably need to remove a proxy server from your browser.  These instruction might help:
https://malwaretips.com/blogs/the-proxy-server-isnt-responding-removal/
Good Luck
            https://malwaretips.com/blogs/the-proxy-server-isnt-responding-removal/
Good Luck
