Error code
Chrome ERR_QUIC_PROTOCOL_ERROR
CHROMEERR_QUIC_PROTOCOL_ERROR
Browser Error Code· An error code shown in a web browser when a page fails to load.
What it means
A QUIC protocol error occurred during a connection to the server.
How to fix it
- Disable QUIC at chrome://flags/#enable-quic and reload.
- Allow UDP traffic on port 443 outbound in your firewall.
- Restart your router.
Not affiliated with Chrome. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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