ERR_QUIC_PROTOCOL_ERROR

If you're encountering the ERR_QUIC_PROTOCOL_ERROR error in your browser, it’s likely due to an issue with the QUIC protocol (Quick UDP Internet Connections), which Chrome and other Chromium-based browsers use to enhance internet speed. QUIC operates over UDP packets instead of TCP, making it faster, but sometimes it can lead to errors. Let’s look at the primary causes of this error and how to resolve it.

Main Causes of ERR_QUIC_PROTOCOL_ERROR

  • Browser Issues: This error often arises due to conflicts in browser settings or from an outdated version that doesn’t support the QUIC protocol properly.
  • Network Settings: Using a VPN or proxy server can block QUIC packets, leading to this error.
  • Antivirus or Firewall Software: Certain antivirus programs and firewalls may block QUIC traffic, which can result in this error.

How to Fix ERR_QUIC_PROTOCOL_ERROR

1. Disable QUIC Protocol in Chrome Settings

This is one of the simplest ways to fix the error. To disable QUIC:

  1. Type chrome://flags into the Chrome address bar and hit Enter.
  2. Search for the Experimental QUIC Protocol flag.
  3. Select Disabled from the dropdown menu, then restart your browser.

2. Check Antivirus and Firewall Settings

Antivirus and firewall programs can block UDP packets, disrupting the QUIC protocol. Try temporarily disabling your antivirus or adding an exception for Chrome.

3. Turn Off VPN or Proxy

If you’re using a VPN or proxy, try disabling it. VPNs and proxies can restrict certain types of traffic, which may cause the error.

4. Update Your Browser

Running the latest browser version can help prevent various errors. Make sure Chrome is updated to the most recent version.