Google Chrome Error Message: "ERR_QUIC_PROTOCOL_ERROR"

When browsing the internet with Google Chrome, you may encounter the error:

This site can’t be reached.
The webpage at https://example.com might be temporarily down or it may have moved permanently to a new web address.
ERR_QUIC_PROTOCOL_ERROR

Cause

The error is related to QUIC (Quick UDP Internet Connections), an experimental protocol developed by Google.
QUIC uses UDP instead of TCP to improve performance for web applications.
Although enabled by default in Chrome, QUIC is not essential for browsing and can sometimes cause connection issues.

Resolution Methods

Method 1: Disable QUIC in Google Chrome

In the Chrome address bar, type:
```
chrome://flags
```
Press Enter.
In the search box, type quic.
Locate Experimental QUIC protocol.
Change the setting to Disabled.
Click Relaunch to restart Chrome.

Method 2: Disable Extensions in Chrome

Sometimes a browser extension conflicts with QUIC.

In the Chrome address bar, type:
```
chrome://extensions
```
Press Enter.
Use the blue slider to disable extensions one by one.
Test after disabling each extension to identify the culprit.

Method 3: Disable Proxy Server (Windows Only)

If you’re on Windows, a proxy configuration may cause the error.

Open the Control Panel.
Go to Internet Options → Connections tab → LAN settings.
Uncheck Use a proxy server for your LAN.
Click OK and restart your computer.