It's really frustrating that Let's Encrypt SSL is working fine on Desktop, iPhone but connection is refused on Android (Redmi Note 9S running Android 11). It does not work in Chrome for Android or Opera for Android either. There is no issue in the firewall as all chains are open for testing purposes. I am running Apache/2.4.38 (Raspbian) and enabled SSL for subdomain e-g subdomain.example.com
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What's the configuration of Apache concerning TLS/SSL, have you set specific ciphers etc.? Is the virtual host "subdomain.example.com" providing only the certificate or the whole chain? – cora Jun 07 '22 at 18:07