Turn on the automatic certificate revocation check on your Google Chrome installation and Chromebook.
Considering threats like the recent Heartbleed bug, it is good practice to set Chrome - at least temporarily - to check the SSL certificate a site is using. Google Chrome browser doesn’t check for SSL certificate revocation by default. However, you can turn it on manually in Settings. Here’s how to do it:
Visit Chrome’s Settings page (go to Menu > Settings, or enter chrome://settings/ in the address bar)
Scroll to the bottom and click on the “Show advanced settings”
Now move to the HTTPS/SSL settings and check the box next to the option “Check for server certificate revocation”