LT behind reverse proxy and ssl, split dns, no audio

Hi,

i need some help on my configuration.
i have LT running behind a reverse proxy with ssl

reverse proxy is on a pfsense (haproxy) which is also the firewall (port forwards)
the proxy & ssl certs is running fine with some other sites

on LAN Side there is also a Split DNS.

used domains for LT

LT airtime.conf
base_url = main.example.com
base_port = 443
force_ssl = true

everything works, but i have no audio output
no audio on WAN connections
and also no audio on LAN Side

Have you checked in the console?

I do have a similar setup for the website, but my stream is still unencrypted. Usually browsers block non-encrypted content on an encrypted page. Could that be the issue?