When a browser receives an expired SSL/TLS certificate, it cannot verify that the site is still trusted. Therefore, it halts the normal HTTPS handshake and presents the user with a full-screen security warning (for example, Chrome's "Your connection is not private"). The user may choose to view the certificate details, return to safety, or continue at their own risk. Browsers do not automatically trust the expired certificate, silently downgrade to HTTP, or fetch a replacement certificate on the site's behalf.
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