If you have upgraded your Mac to “EL Capitan“, you will probably encounter this issue when you trying to open Trello in Chrome.
Your browser was unable to load all of Trello’s resources. They may have been blocked by your firewall, proxy or browser configuration.
Press Ctrl+F5 or Ctrl+Shift+R to have your browser try again.
Apparently, it is “NOT” the firewall issue as it describes. In fact, it is about the SSL certificate issue – Chrome cannot access to Trello CDN – specifically, opening the link of
d78fikflryjgj.cloudfront.net. If you open the
test link (
https://d78fikflryjgj.cloudfront.net/test.html) in Chrome, you will the SSL warning.
Check this link for detail – Trello’s CDN.
To fix it, open this link
https://d78fikflryjgj.cloudfront.net/test.html in Safari and then “Trust” the SSL of this link. Once done, go back to Chrome and you should be OK to open Trello now.