ZyXEL Communications NSA-220 Plus User Manual page 241

Then click the NSA's link to reconnect.
4
Figure 91 iTunes Reconnected
Another way to get the NSA's iTunes server function to scan the published media
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server folders for files is to go to Applications > Media Server and disable and
re-enable the iTunes server option. If you uploaded many files, it may take awhile
for the NSA to find and list all of them. Then try reconnecting your iTunes client.
I cannot use iTunes to play files located on my NSA.
Make sure the files are a format supported by iTunes. See
1
251.
If you have files from the iTunes Store that use DRM, you need to use your Apple
2
account ID and password to authorize other computers to play the files. Apple
permits you to authorize up to five computers at a time. To authorize a computer,
open iTunes and click Store > Authorize Computer.
If you are connecting through a NAT router, make sure that TCP port 3689 and
3
UDP port 5353 are open for traffic on both the server and the client and all points
in between (especially the NAT router). If your router includes a firewall, make
sure it also allows TCP port 3689 and UDP port 5353 traffic.
NSA-220 Plus User's Guide
Chapter 13 Troubleshooting
Section 14.5 on page
241