[Koha] need help with accessing koha from outside via DynDNS

[Heinz-Jürgen Oertel]

Hello,
I'm still in the process of testing Koha, I have installed it on a virtual 
machine on my local network. This works so far. I also added some books to the 
database.
Now I want to let other people outside of my local network test this 
installation, but I'm not able to reach it

I can reach my network vi   something.dnshome.de 
With a port forwarding 80 -> 80 in the network router I can reach the test 
page of the apache server.
How  can I reach the koha server

-- 
regards
       Heinz