Android App uses wrong SSL certificate // no trusted SSL server

[mulmer]

Maybe your nginx cypher doesn’t fit the Android device. I had a similar issue. Check this thread

Android Client cannot verify letsencrypt certificate

Hello all, I have my seafile server running now since a couple of months. I used certbot to integrate a letsencrypt certificate. It works fine in LAN and WAN on multiple devices. Yet I have one Android Phone in the field that suddenly got a certificate issue. It says not trusted connection and cannot verify the issuer, the fingerprint and timestamp at all. I’ve tried clearing cache and data, reinstalling, LTE vs Wlan, checked AV settings with other devices that work and also imported the certif…