The Chrome Metamask cannot connect to networks

[JoshuaAiYimi]

Hi All,
Sorry, if this has been answered before.
My MetaMask could not connect to the main ethereum network. And all of the other networks (i.e. ropsten, kovan, rinkeby) couldn't be connected either. I wonder if anyone know something about this.
I am using Chrome, Windows7
Thanks!

[tmashuang]

Some of the quick solutions would be to switch networks in the network indicator and switch back to Mainnet. Other issues could that some networks could block the network calls for MetaMask to work properly.
#2043, #2529, and potentially #3151.

[kovrigin92]

I think it will be interesting to everyone who faced this problem before the problem occurred, I saw a message on my computer (the firewall tried to block one of the certificates), I did not hesitate to ban traffic, after that I again allowed access and everything worked! I apologize if anyone then already solved the problem the same way![

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[whymarrh]

I'm closing this for now (it's been a while). Please open up a new issue if you're still having problems.