This error usually indicating that there is no entry of " gds_db 3050/tcp"
in the SERVICES file on either the client or the server machine. Add the entry to the file,
making sure there is a carriage return line feed after the entry if is is the last entry on
the list, and reconnect. The location of the SERVICES file is usually in:
Unix /etc/SERVICES
Windows WINNT\system32\drivers\etc\SERVICES
or
WINDOWS\system32\drivers\etc\SERVICES
or
WINDOWS (Windows 98)