ERR_SPDY_PROTOCOL_ERROR

ERR_SPDY_PROTOCOL_ERROR Error

Category: Browser Errors | Platforms: chrome

What This Error Means

The ERR_SPDY_PROTOCOL_ERROR indicates a problem with the SPDY protocol, a deprecated predecessor to HTTP/2. Even though SPDY is largely obsolete, the error name persists in Chrome for HTTP/2 related issues.

Common Causes

  • Outdated browser.
  • Corrupted socket pool in the browser.
  • Antivirus or firewall interfering with secure connections.
  • Server-side HTTP/2 misconfiguration.

How to Fix It (For Users)

  1. 1 Update Google Chrome to the latest version.
  2. 2 Flush sockets in Chrome: go to chrome://net-internals/#sockets and click 'Flush socket pools'.
  3. 3 Disable antivirus HTTPS scanning temporarily.

For Site Owners / Developers

  1. Ensure your server's HTTP/2 implementation is up to date.
  2. Check Nginx/Apache logs for protocol errors.
  3. Verify SSL/TLS configuration.

When It Is NOT Your Fault

If the browser's implementation of the protocol is buggy.

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