Buffalo TS-XL User Manual page 76

Remote Access - WebAccess
With Buffalo's WebAccess, you can access your
TeraStation from anywhere in the world with
an Internet connection. It's easy to access your
files, or share them with other people, wherever
they may be.
To use WebAccess, Enable 'WebAccess Service'.
You may also enable SSL Encryption if desired.
Using 'BuffaloNAS.com' is recommended.
Otherwise, you'll have to manage your own
DNS settings.
'Auto-Configure Firewall' is recommended if
your router supports UPnP (most do since 2001). If you choose not to enable this, then you must
manually configure your router and firewall to forward internal port 9000 to the Internet.
Choose a name for your BuffaloNAS account and a password ("key"). This name is the name that
will be used to access your TeraStation and to share with your friends. The password for this
protects other people from using it, so picking a strong password is recommended. If you get a
message that your chosen account name is already in use, then choose a different account name.
Click Help in the top right of the window for detailed information on each setting.