First: Thanks to Let’s Encrypt for the easy way of requesting a certificate.
I’ve set up a certificate on my webspace including several domains. It’s working perfectly on PC and in the browsers of Android. But if I want to make a HTTPS-Request from my Android-App it gets the error “couldn’t load webpage”.
I got the same error by using certificates from CAcert. I thought it’s because android doesn’t trust them.
But Android should trust Let’s Encrypt. (In the standard browser it works without any errors.)
What could be the reason for the error?
Thanks in advance, m.b