1st. I’m very sorry for necroing this thread.
I wondered if you solved this issue?
We have a very similar problem. The unreal engine built in xmpp connecting to ejabbered.
it seems it works if we disable ssl.
if the original poster is not around. Does anyone know why the built in xmpp does not seem to be using the correct certs?
I see an sslroots.h in webrtc folders which does not include the cert I need but to change this will require building the engine ue4. We are using letsencrypt with the server.
Is there somewhere it uses pem file?