Apache 2.4 Owncloud Redirection

Hi everybody,
I am new here, so please, be nice to me! (Already posted in Apachelounge)
I'm using an ownCloud 10.x server on a Linux Mint computer with Apache 2.4. Due to a change in network infrastructure, access to the server had to be changed. The server is now in a demilitarized zone on a router to which I have no administrative access. Port forwarding has been configured with 8080 on port 80 and port 40440 on port 443. External access with ownCloud client via port 40440 is working properly, but …

Apache 2.4 Owncloud Redirection