Reverse Proxy

[L. Grün]

Hello,
for three days I have been struggling to get OM available through 
Reverse Proxy:

Setup acc. 
https://www.mail-archive.com/openmeetings-user@incubator.apache.org/msg02905.html

config.xml:

<rtmphostlocal>rtmpt.mydomain.com</rtmphostlocal>
<httphostlocal></httphostlocal>
<rtmpport>1935</rtmpport>
<rtmpTunnelport>80</rtmpTunnelport>
<rtmpsslport>443</rtmpsslport>
<useSSL>no</useSSL>
<red5httpport>80</red5httpport>
<protocol>http</protocol>
---------------------------------

red5.properties:

# HTTP
http.host=0.0.0.0
http.port=5080

# RTMP
rtmp.host=0.0.0.0
rtmp.port=1935

# RTMPT
rtmpt.host=0.0.0.0
rtmpt.port=8088

------------------------------

/etc/apache2/enabled-sites:

1) openmeetings.mydomain.com:

<VirtualHost *:80>
    ServerName openmeetings.mydomain.com
    <Location /openmeetings>
            Order allow,deny
            Allow from all
    </Location>
    ProxyRequests Off
    ProxyPass / http://192.168.1.187:5080/
    ProxyPassReverse / http://192.168.1.187:5080/
</VirtualHost>
------------------------

2) rtmpt.mydomain.com:

<VirtualHost *:80>
    ServerName rtmpt.mydomain.com
    <Location /openmeetings>
            Order allow,deny
            Allow from all
    </Location>
    ProxyRequests Off
    ProxyPass /openmeetings 
http://openmeetings.mydomain.com:5080/openmeetings
    ProxyPassReverse /openmeetings 
http://openmeetings.mydomain.com:5080/openmeetings
    ProxyPass / http://openmeetings.mydomain.com:8088/
    ProxyPassReverse / http://openmeetings.mydomain.com:8088/
</VirtualHost>

---------------------------
FW open ports: 80 8088
DNS: /etc/hosts file up to date; External DNS setup.

OM runs on LAN side
OM over Internet: Loading a while (spinning thing) and then Error msg. 
(Error Missing [204], [556],[642])

What is wrong with this setup? Thank you in advance!

Steven