Chrome network error · -20 · System

ERR_BLOCKED_BY_CLIENT

Something in the browser itself blocked the request, usually an ad blocker or privacy extension that matched the URL against its filter lists.

Chromium's description

The client chose to block the request.

Chrome shows it as net::ERR_BLOCKED_BY_CLIENT, error -20. puppeteer and Playwright report the same name when a page fails to load in Chromium.

Common causes

An ad blocker (uBlock Origin, AdBlock) or tracker blocker blocking a script, image or the page.
An antivirus browser extension.
Browser policies of a managed computer.

How to fix ERR_BLOCKED_BY_CLIENT

Disable the ad blocker for the site, or allow the blocked URL.
Test in an incognito window without extensions.
Developers: rename files and paths that look like ads (/ads/, banner.js) so filter lists do not match them.

ERR_BLOCKED_BY_CLIENT in the screenshot API

With block_ads=true (ads and trackers) or block_cookie_banners=true (some cookie-consent scripts) the renderer blocks requests the same way; the blocked requests fail with this error and the page renders without them. Without these options nothing is blocked.

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.

Check whether a website loads

Device

Format

Full page Block ads

Rendered in a real browser with cookie banners hidden. Takes 5–30 seconds.

Frequently asked questions

What does ERR_BLOCKED_BY_CLIENT mean?

Something in the browser itself blocked the request, usually an ad blocker or privacy extension that matched the URL against its filter lists.

How do I fix ERR_BLOCKED_BY_CLIENT?

Disable the ad blocker for the site, or allow the blocked URL.

Is a screenshot that fails with ERR_BLOCKED_BY_CLIENT billed?

The render is not stopped by this error: the page renders without the blocked requests, and the screenshot counts like any other. Only requests the 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_QUIC_PROTOCOL_ERROR ERR_NAME_NOT_RESOLVED ERR_TOO_MANY_REDIRECTS ERR_NETWORK_CHANGED

All 249 Chrome network errors · Screenshot API errors

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