Twitter and G+ Share not work

Hi,

Sharing via Twitter and G+ seems not to work now. I don’t know if it is the settings of the plugin or what.

When I try these two share buttons, they fail, and the browser gives the notice:

“twitter.com’s server IP address could not be found.”

If I try running Windows Network Diagnostics, it says:

“Windows can’t find the host name “twitter.com” using DNS”

Same with G+

What should be the problem then?

Thanks.