ERR_SSL_OBSOLETE_CIPHER -172

Net error -172

BROWSER

The SSL server required an unsupported cipher suite that has since been removed.

Browser error page with a network error code and a checklist of likely causes
Browser network errors: rule out your connection first, then the site.

What it means

ERR_SSL_OBSOLETE_CIPHER is a Browser error code reported by Google Chrome, Microsoft Edge and other Chromium browsers. Its official message is: “The SSL server required an unsupported cipher suite that has since been removed.”

How to fix ERR_SSL_OBSOLETE_CIPHER

  1. Reload the page once — single transient failures heal themselves immediately
  2. Flush DNS: 'ipconfig /flushdns' on Windows, 'dscacheutil -flushcache' on macOS
  3. Disable VPN, proxy settings and your antivirus web shield, then retry
  4. Test the same page from mobile data or another device to isolate YOUR setup from the site
  5. Bypass performance extensions: open a private window, disable ad-blockers and retry

Related errors

ERR_SSL_VERSION_OR_CIPHER_MISMATCHERR_SSL_PROTOCOL_ERRORERR_SSL_CLIENT_AUTH_NO_COMMON_ALGORITHMSERR_SSL_SERVER_CERT_BAD_FORMATERR_CT_CONSISTENCY_PROOF_PARSING_FAILEDERR_WS_UPGRADEERR_UNABLE_TO_REUSE_CONNECTION_FOR_PROXY_AUTH

Source: Chromium net_error_list.h

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