Shopify issues and renews the certificate for you, so this almost always means a custom domain whose DNS still points somewhere else — Shopify cannot renew a certificate for a domain it does not control.
Shopify issues and renews the certificate for you, so this almost always means a custom domain whose DNS still points somewhere else — Shopify cannot renew a certificate for a domain it does not control.
In Shopify admin → Settings → Domains, check the domain shows 'Connected' with SSL 'Active'. If the CNAME still points at an old host, repoint it to shops.myshopify.com and wait for the certificate to reissue (usually under an hour).
Shopify has its own failure mode, but ERR_CERT_DATE_INVALID has a wider set of causes. The most common one overall is: The certificate expired and auto-renewal silently stopped.
Renew immediately. For Let's Encrypt, run the renewal manually and read the output — the usual cause is a failing HTTP-01 challenge after a redirect or firewall change.
The SSL checker returns the exact notAfter date and days remaining for the hostname, which immediately separates 'genuinely expired' from 'your clock is wrong'.
Shopify issues and renews the certificate for you, so this almost always means a custom domain whose DNS still points somewhere else — Shopify cannot renew a certificate for a domain it does not control.
In Shopify admin → Settings → Domains, check the domain shows 'Connected' with SSL 'Active'. If the CNAME still points at an old host, repoint it to shops.myshopify.com and wait for the certificate to reissue (usually under an hour).
The certificate the server presented is outside its validity window — almost always expired. Either the certificate genuinely lapsed, or the device's clock is wrong so a valid certificate looks expired.