I have free Comodo SSL certifficate from Cludflare and i cant access my website via https via Android 2.3.6 and also on Windows XP internet explorer. These are old apps, but still i think it is quite a issue. ssllabs.com/ssltest says following errors when i test my domain: Android 2.3.7 No SNI 2 Server sent fatal alert: internal_error IE 6 / XP No FS 1 No SNI 2 Server sent fatal alert: handshake_failure IE 8 / XP No FS 1 No SNI 2 Server sent fatal alert: internal_error SNI - Browser does not support Server Name Indication FS - Browser effectively does not support Forward Secrecy Please what do you suggest? I do not wish to purchase SSL. I see Lets Encrypt free SSL has A+ rating on this page: https://www.ssllabs.com/ssltest/analyze.html?d=minehub.de Free WoSign certifficate shows some mismatch error, but shows the https page. Is my only option to switch to other certificate authority? Which one will allow me to browser on IE6, IE8 and old Android as mentioned?