I am using Windows 8.1 64 bits and also had the same problem ("ERR_CONNECTION_REFUSED") that only happened on Google Chrome. On clicking on the "Detail" on the right of the error message, the problem lies with "127.0.0.1", in my case. So I went to the settings and opened "Manage search engines .." box in the Search section, and while scrolling down, I saw that "Google Desktop, 127.0.0.1" was made a "Default", so I switched over to Google as the default. Hope that might be of any help.
ERR_CONNECTION_REFUSED – Solutions Encyclopedia