To verify that SQL Server is listening on AppleTalk and can accept a client connection
isql -Usa -P -Sservicename
If you can connect with ISQL and execute queries, the server is properly configured to listen on AppleTalk and is accepting connections.
Note The Microsoft Win32® AppleTalk (ADSP) client side Net-Library (Dbmsadsn.dll) is included for testing ADSP connections and troubleshooting AppleTalk connections between Macintosh clients and Microsoft SQL Server™. This Net-Library is intended to be used only when testing a connection from a remote client to SQL Server. If you attempt to make local connections through the ADSP Net-Library to a server running SQL Server and listening on AppleTalk, the following network error is generated:
Net-Library error 11: getsockopt().