Listener supports no services

Hi .. I am using Ubuntu 11.04, Oracle 11g Enterprise on a local machine and everything works fine except when I try to log in using useris/passwd@Hostname. If I log in to sqllus with userid / passwd .. everything is fine.

The hostname is SpongeBob and I can ping the host name and the fully qualified name.

tnsnames.ora

SPONGEBOB
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = SpongeBob)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = amr)
    )
  )
 
Listener.ora

SPONGEBOB =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = SpongeBob.xxx.xxx.com)(PORT = 1521))
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = SpongeBob)(PORT = 1521))