kitöröltem az előzményeket
újraindítottam a Chrome-t
és utána működik.

• rebooting the computer
• resetting Chrome (deleting all Content & Cookies; restoring all default browser settings)
• launching Chrome with no extensions, as well as in incognito mode
• disabling all extensions manually
• uninstalling and re-installing Chrome
• temporarily disabling my virus protector (Microsoft Security Essentials)
• typing in IP addresses directly
• Command Prompt (Run as Admin): netsh winsock reset (+ Restart)
• Clear the host cache (in chrome://net-internals/#dns)
• growling fiercely at the computer

vagy további módszerek:

https://superuser.com/questions/804438/chrome-is-unable-to-connect-to-the-internet

https://superuser.com/questions/805548/chrome-cant-connect-to-internet-but-other-browsers-can