I get an error ORA-28547 each time I try to connect to the running instance of from a host different than the one oracle is running on.
The listener.ora is as follows:

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = IMA)
(ORACLE_HOME = /opt/oracle/app/oracle/product/10.1.0/db_1)
(PROGRAM = extproc)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
)
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = oracle-lh)(PORT = 1521))
)
)
)

the tnsnames.ora:

IMA =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = oracle-lh)(PORT = 1521))
(CONNECT_DATA =
# (SERVER = DEDICATED)
# (SERVICE_NAME = IMA)
(SID = IMA)
)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

and the sqlnet.ora:

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

any idea of what's wrong? A ps -ef reports this process running:

oracleIMA (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))

can PROTOCOL=beq be the cause of the mess?
Please help!!
Thanks in advance

Thank you very much, it works now!!