Can't view orders when I use SSL. Error Undefined.

OpenCart 2.1.0.1 problem.

I've installed SSL for my site (which was a pain in the a.. to get to work). Now it's finally working but i get to see an error when opening an order in admin.
In internet explorer it shows "access denied, undefined error". In firefox it's simply "network error". In Chrome ''Error Undefined''

How can I fix this problem?

Make sure you change all links in both config.php files to HTTPS

In my view, this error occurs due to using the old version of chrome. SSL is Secure Sockets Layer which is security protocol for establishing encryption. It is basically for the security purpose. If you are using chrome and having an issue related to it visit Fix Err Spdy Protocol Error or https://notresponding.net/fix-err_spdy_protocol_error/ for the best solution.

I have it implemented on a creation site running 2.1.0.1 for multi-month now since I was excessively lethargic, making it impossible to fix the order.php controller and I can affirm firsthand that it will work, however, it is a monstrous hack and not a long haul arrangement.