To get afp (AppleTalk) working on an SG20, you need to do the following:

1. Edit the file "/etc/atalk/afpd.conf" and add the following line:

- -transall -loginmesg "Welcome to the SG20."

2. Restart the SG20.

Then you will be able to connect using AppleTalk from both Mac OS 9 and Mac OS X.