ERR_SPDY_PROTOCOL_ERROR

The ERR_SPDY_PROTOCOL_ERROR error often appears when using Google Chrome and indicates issues with the SPDY protocol, which is designed to speed up webpage loading. Let's explore the common reasons for this error and how to fix it.

Main Causes of ERR_SPDY_PROTOCOL_ERROR

• Conflict with browser extensions — some extensions may interfere with the SPDY protocol.
• Cache or cookie issues — outdated data stored in the browser can lead to connection errors.
• Incompatibility between browser and server versions — an outdated browser or server setup might not fully support modern protocols.
• Antivirus or firewall interference — certain security programs block SPDY traffic, causing this error.

How to Fix ERR_SPDY_PROTOCOL_ERROR

1. Clear Browser Cache and Cookies

Go to Chrome settings and select Clear browsing data. Ensure that Cached images and files and Cookies and other site data are selected. Click Clear data and restart your browser.

2. Disable Conflicting Extensions

Navigate to chrome://extensions/ and disable extensions one by one. After disabling each extension, reload the page to identify which one might be causing the error.

3. Update Google Chrome

Using an outdated browser version can lead to protocol support issues. Check for Chrome updates by going to Settings > Help > About Google Chrome.

4. Reset Network Settings

Try resetting your network settings. Open the Command Prompt and execute the following commands:

ipconfig /flushdns
netsh winsock reset

Restart your computer afterward.

5. Temporarily Disable Antivirus or Firewall

Sometimes, antivirus programs block certain connections. Temporarily disable your antivirus or firewall to see if the error resolves.