I'm not sure what the hell is going on here but I can't access most of Bitcoin websites , website that I have tried so far are Blockchain.info , Coinmarketcap.com , BTC.com , Blocktrail.com , Poloniex.com , Kraken , Wirexapp , CoinsBank , Bitmixer.io and the list goes longer ...
Firefox keep giving me the following error : The connection has timed out , The server at Poloniex.com is taking too long to respond. (All websites)
Can you access from your phone or you can't access these websites from any devices connected on the same network, also try in CMD to "ping poloniex.com" and see if it works or not.