Chrome network error · -356 · HTTP

ERR_QUIC_PROTOCOL_ERROR

The connection over QUIC (HTTP/3), the UDP-based protocol Chrome uses with many large sites, failed. Usually something on the network handles UDP traffic badly.

Chromium's description

There is a QUIC protocol error.

Chrome shows it as net::ERR_QUIC_PROTOCOL_ERROR, error -356. puppeteer and Playwright report the same name when a page fails to load in Chromium.

Common causes

A firewall, router or antivirus blocks or mangles UDP on port 443.
A VPN or proxy that does not support QUIC.
A browser extension or experimental Chrome flag.
A temporary problem on the site’s CDN.

How to fix ERR_QUIC_PROTOCOL_ERROR

Reload; Chrome often falls back to HTTP/2 over TCP.
Turn off the VPN or proxy and the antivirus web shield.
Disable extensions to find one that interferes.
As a last resort, turn QUIC off at chrome://flags/#enable-quic.

ERR_QUIC_PROTOCOL_ERROR in the screenshot API

The renderer has QUIC switched off: it talks HTTP/1.1 and HTTP/2 over TCP only, so a screenshot or PDF of the page does not fail with this error.

Only the page's own load can fail a render. An image, script or frame of the page that fails with a network error does not: the page is captured as the browser shows it without that resource.

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Frequently asked questions

What does ERR_QUIC_PROTOCOL_ERROR mean?

The connection over QUIC (HTTP/3), the UDP-based protocol Chrome uses with many large sites, failed. Usually something on the network handles UDP traffic badly.

How do I fix ERR_QUIC_PROTOCOL_ERROR?

Reload; Chrome often falls back to HTTP/2 over TCP.

Is a screenshot that fails with ERR_QUIC_PROTOCOL_ERROR billed?

No. Requests the screenshot API answers with an error are not billed.

Other common errors

ERR_CONNECTION_RESET ERR_CONNECTION_REFUSED ERR_CONNECTION_TIMED_OUT ERR_CACHE_MISS ERR_ADDRESS_UNREACHABLE ERR_TIMED_OUT ERR_SSL_PROTOCOL_ERROR ERR_CONNECTION_CLOSED ERR_NAME_NOT_RESOLVED ERR_TOO_MANY_REDIRECTS ERR_NETWORK_CHANGED ERR_SSL_VERSION_OR_CIPHER_MISMATCH

All 249 Chrome network errors · Screenshot API errors

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