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App complaining about missing root certificate (Let's encrypt installed)

Posted: Tue Oct 08, 2019 2:51 am
by SandraLou
I installed a Let's encrypt certificate with the MyQnapCloud. works fine in my browser when I access qnap with the https://[mynas]

On my android-phone I have apps complaining about a missing root certificate. This is when I use FTP with explicit SSL. How to solve this? i admit that I don't understand too well how to install certificates (but the Let's Encrypt one is working for https! Yay!)