Android App only works with unsafe ciphers in nginx

Seafile Client
,
1

Hi guys,

I switched from an old phone with LineageOs to a new LG G6 with stock Android 7.
Unfortunately the seafile app doesn’t accept my LetsEncrypt certificate (no problems on my old phone).
(“SSL Certificate not trusted”). I have a SSL Labs A+ Rating. The desktop clients work fine. Also other apps on my phone can connect to my hosted services.

Nginx SSL Config:

ssl_certificate /etc/letsencrypt/live/example.de/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.de/privkey.pem;
ssl_trusted_certificate /etc/letsencrypt/live/example.de/fullchain.pem;
ssl_dhparam /etc/ssl/private/dhparams_4096.pem;
ssl_ecdh_curve secp384r1;

ssl_protocols TLSv1.2;
ssl_ciphers ‘ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-    CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-    RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256’;
ssl_prefer_server_ciphers on;

ssl_session_timeout 1d;
ssl_buffer_size 4k;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;

ssl_stapling on;
ssl_stapling_verify on;
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 10s;

proxy_set_header X-Forwarded-For $remote_addr;

add_header Strict-Transport-Security “max-age=31536000; includeSubdomains”;
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection “1; mode=block”;

It works with those ciphers:

ssl_ciphers ‘ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS’;

Best regards!!