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
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The error is related to QUIC (Quick UDP Internet Connections), an experimental protocol developed by Google.
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QUIC uses UDP instead of TCP to improve performance for web applications.
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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
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In the Chrome address bar, type:
chrome://flags -
Press Enter.
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In the search box, type quic.
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Locate Experimental QUIC protocol.
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Change the setting to Disabled.
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Click Relaunch to restart Chrome.
Method 2: Disable Extensions in Chrome
Sometimes a browser extension conflicts with QUIC.
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In the Chrome address bar, type:
chrome://extensions -
Press Enter.
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Use the blue slider to disable extensions one by one.
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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.
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Open the Control Panel.
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Go to Internet Options → Connections tab → LAN settings.
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Uncheck Use a proxy server for your LAN.
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Click OK and restart your computer.
