If you are getting the the same ERR_SPDY_PROTOCOL_ERROR error code in Google Chrome as as I have. Then we can try to fix it by flushing the Chrome Sockets.

Let’s fix ERR_SPDY_PROTOCOL_ERROR

Then you can try flushing you sockets. Don’t worry this will only close correct connections in your tabs and won’t reset any of your settings.
Close all your tabs first then hit up the url bar in Chrome and enter

 chrome://net-internals/#sockets

You will then be taken to the interals of Chrome.

Now make sure you click both button to flush the sockets and you are done!
Let’s check if you can access the website where you were getting the error ?

Success! Let me now if the ERR_SPDY_PROTOCOL_ERROR fix worked for you!.