Chrome network error · -159 · Connection

ERR_SSL_UNRECOGNIZED_NAME_ALERT

The server rejected the TLS handshake because it has no configuration for the host name Chrome asked for (the SNI name).

Chromium's description

The SSL server sent us a fatal unrecognized_name alert.

Chrome shows it as net::ERR_SSL_UNRECOGNIZED_NAME_ALERT, error -159. puppeteer and Playwright report the same name when a page fails to load in Chromium.

Common causes

The domain points to a server or CDN that is not set up to serve it, for example a new domain before its certificate exists.
A virtual host missing for this name in nginx or Apache.
A misconfigured load balancer listener.

How to fix ERR_SSL_UNRECOGNIZED_NAME_ALERT

Site owners: add the host name to the server’s TLS configuration (server_name, virtual host, CDN custom domain) and issue a certificate for it.
Check that the DNS record points to the right server.
Visitors: try the other variant of the name (with or without www).

ERR_SSL_UNRECOGNIZED_NAME_ALERT in the screenshot API

When the page itself fails to load with ERR_SSL_UNRECOGNIZED_NAME_ALERT, the API answers 502 with the message The target website could not be loaded (ERR_SSL_UNRECOGNIZED_NAME_ALERT). (target_unreachable). Not billed.

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_SSL_UNRECOGNIZED_NAME_ALERT mean?

The server rejected the TLS handshake because it has no configuration for the host name Chrome asked for (the SNI name).

How do I fix ERR_SSL_UNRECOGNIZED_NAME_ALERT?

Site owners: add the host name to the server’s TLS configuration (server_name, virtual host, CDN custom domain) and issue a certificate for it.

Is a screenshot that fails with ERR_SSL_UNRECOGNIZED_NAME_ALERT 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_QUIC_PROTOCOL_ERROR ERR_NAME_NOT_RESOLVED ERR_TOO_MANY_REDIRECTS ERR_NETWORK_CHANGED

All 249 Chrome network errors · Screenshot API errors

Screenshot API

Take screenshots from your code

screenshotbase renders any website in a real browser and returns the image: full page or viewport, any device size, retina, from 100+ countries, with cookie banners and ads hidden.

/v1/take documentation Screenshot API All documentation

300 free screenshots every month. No credit card required.

GET https://api.screenshotbase.com/v1/take?url=https://example.com&full_page=true

# Response: the image (PNG, JPG, WebP or GIF)
curl -G "https://api.screenshotbase.com/v1/take" \
  --data-urlencode "url=https://example.com" \
  -d viewport_width=1280 -d viewport_height=800 \
  -d format=png \
  -H "apikey: YOUR-API-KEY" \
  -o screenshot.png

More free tools

Website screenshot Capture any page as an image. Full page screenshot Capture a whole page, top to bottom. Mobile website screenshot See a site on iPhone, Android and iPad. URL to PDF Save any web page as a PDF. URL to markdown Turn a web page into markdown. HTML to PDF Print your own HTML as a PDF. HTML to image Render HTML and CSS as a PNG, JPG or WebP. HTML to markdown Turn HTML into clean markdown. URL to PNG Save a web page as a PNG image. URL to JPG Save a web page as a JPG image. Scrolling screenshot One long image of a page, no stitching. HTML to PNG Render HTML as a lossless PNG. HTML to JPG Render HTML as a compact JPG. Viewport sizesScreen sizes and pixel ratios of 46 devices. ErrorsChrome network errors and screenshot API errors, with fixes.