They are all UK based, my partner just tried now on WIFI and seemed to work but she had no access at all on 4G which is the same for the others
Topic summary
Shop visitors see SSL/security warnings on custom domains, especially on the www subdomain. Firefox reports HSTS (forces HTTPS, no exceptions) and SSL_ERROR_BAD_CERT_DOMAIN showing a certificate valid only for *.myshopify.com.
Primary case (magsrags.net):
- Symptoms: www.magsrags.net blocked (Firefox), root magsrags.net loads; initially Edge also warned, later Edge allowed access.
- Diagnosis: A record correct (23.227.38.74). CNAME for www was set to magsrags.myshopify.com but should be shops.myshopify.com (Shopify standard).
- Actions: Merchant updated CNAME at GoDaddy; issue briefly resolved, then returned in Firefox. Advised to contact Shopify Support for deeper account-level review after DNS propagation (up to 48 hours).
Secondary case (percnt.com):
- Symptoms: Some customers (UK) get “certificate not trusted,” especially coming from Instagram and on 4G/mobile data. Works on Wi‑Fi and for users in other regions (e.g., Canada).
- Checks: DNS correctly points to Shopify. No obvious misconfiguration.
- Next steps: Verify with GoDaddy that certificates are correct; rule out link shorteners; consider carrier/network issues; contact Shopify Support to confirm backend domain/SSL status. Screenshots from customers are relevant evidence.
Status: No confirmed resolution yet. Key tasks are ensuring www CNAME = shops.myshopify.com, allowing propagation, and escalating to Shopify/GoDaddy and possibly mobile carriers if issues persist.