How to Fix the ERR_SPDY_PROTOCOL_ERROR in Chrome (5 Methods)Method 1: Update and Restart Your Browser.Method 2: Use Google Chrome's Incognito Mode.Method 3: Clear Your Browsing Cache.Method 4: Flush the SPDY Pockets.Method 5: Clean the DNS and Renew the IP.Nov 3, 2020
One issue that users reported is err_spdy_inadequate_transport_security message. This issue usually affects web developers, and it can interfere with the development process. It's also called the NS_ERROR_NET_INADEQUATE_SECURITY error and it usually occurs when accessing websites hosted on IIS 10.0.Feb 9, 2021