> CONNECT 'Y:/Controller/Development/db/Controller.gdb'
> USER 'SYSDBA'
> PASSWORD 'masterkey';

Is Y: a physical drive. It will not work with mapped drives
( and you still better of with the TCP/IP bit as well ).
The AT command will run as a new user, so may not have the
same mapped drives anyway. ( I've been caught by that when
backing up files this way )

--
Lester Caine
-----------------------------
L.S.Caine Electronic Services