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 certificate manually. The user has no issue with her other devices (windows and iOS)
Her security settings on her Android are also the same as mine. I don’t know what to do anymore and need assistance. Since all other devices work fine I’m sure it’s a issue on that phone. Any ideas?