Hi Stephan,

a listener anme must be unique on a server. You must rename one of the two listeners to listener10g or listener9i, if you want to use two listeners. But you could also use the 10g listener for both databases.
If you are using two listeners, the ports must be different two.

You have to edit the listener.ora and replace the listener name:

LISTENER_ASINFRA1 =
(DESCRIPTION_LIST =
  (DESCRIPTION =
   (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = test.test.com)(PORT = 1521))
   )
     (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
   )
  )
)


HTH


Oliver Gehlert