DNS forwarding over 2 domains doesen't work with SSL

Hello,

I just set up a raspberry Pi with owncloud using nginx.
Everythings works fine in my LAN but of course I'd like to access it from outside (too).
What I have/use for that:
Raspberry with static IP
Router with DynDNS and Portforwarding 80+443 to Raspi
DynDNS-domain myname.no-ip.org
"Real" domain (myname.eu) which is set to forward all to myname.no-ip.org
A selfmade SSL-certificate

So the way ist:
call https://www.myname.eu
it will redirect to https://myname.no-ip.org which points to my router
The Router forwards those requests to the raspi

What works:
https://192.168.178.3 gives me the owncloud-Login
https://myname.no-ip.org does the same

But:
https://www.myname.eu says ssl_error_unrecognized_name_alert (using firefox)

I tried to re-create the certificate with 192.168.178.3, myname.no-ip.org as well as myname.eu for common_name but only reached that I couldn't access it via 192....

Since I'm not verry skilled in setting up server I'd like to know where I have to search. Do I have to add a server in the nginx-configuration or just rename it?

Thanks!

BTW: I'd like to acess the same site by calling 192.168... in the LAN as well as by calling www.myname.eu if that's possible!