dekoh photos behind firewall?

Hi, how can I share photos from my NAS with other friends over the internet?
The NAS ist connected to my private LAN, the private LAN ist connected to the internet over a firewall router. Inviting friends works, but when link in email is clicked, message "user [...] offline" appears.
Which Ports do I have to forward to my NAS? (Router and NAS can be accessed over dyn. DNS., NAS: readynas nv+)
How does it works to connect to dekoh photos in my private network from internet?

Hello :

Which version of ReadyNAS Photos Add on are you using. The latest version of add is 1.8. You can download it from here :

http://www.readynas.com/?page_id=617

To share photos using ReadyNAS Photos, just make sure your NAS is connected to the Internet.

Is your NAS setup with DHCP IP or Static IP? If static, do you have a Gateway and DNS setup under Network>Global Settings.
Do you have System>Alerts Contacts setup as well, and receive those (you can Send a Test message there as well)?
Also, does the 'Check for Updates' under System>Update work, or report connection problems?

These things will help us narrow down any connection issues your NAS has with reaching the Internet.

Thank you
-Prashant

I was sure that connection was ok because webdav-/http-acces from the internet works fine the whole time.
After you hint I have just checked the 'Test Message' and i recognized, that this doesn't work since last config-change on router... a small error in source-adress-filter... After correction everything works!

Sorry, my fault - but thank you very much for the quick reply! Perfect support! Everything works fine and everybody can access the photos!