Chrome HTTP2.0 throws SPDY PROTOCOL ERROR
Most people’s reaction to this error would be to reload the web page. We would actually recommend this as a first response. Sometimes this even does work.
Interesting Factoid: SPDY actually stands for “speedy” and is used to reduce a web pages’ load time
If reloading the web pages does not remove the error, then you should close down Google Chrome and restart it. This alone will not really solve the problem because you will need to clear the cache as soon as you restart the browser.
or in cmd clear dns using this command ipconfig/flushdns