currently I use dyndns and NAT on my home router to access my NAS from WAN.
Let's say my dyndns address is <wan.net> and my NAS name is "omv". My router already resolves omv.<wan.net> to the same IP from inside LAN and WAN. Accessing services from WAN via omv.<wan.net>:<port> works, but gives failures if I try to open this addresses from the LAN.
FTP: From LAN, logging into "ftp://omv.<wan.net>" gives "530 Login incorrect." but "ftp://omv" works.
Owncloud: Accessing owncloud from WAN at "https://omv.<wan.net>:<port>" does work, but times out with the same url from inside the LAN. In the special case of owncloud I am not even able to access it from the inside, because I needed to configure "'overwrite.cli.url' => 'https://omv.<wan.net>:<port>'".
Any idea, what could be the reason for that?