Hát, sajnos nem boldogulok vele.
A listener .ora így néz ki:

# listener.ora Network Configuration File: C:\oracle11Clie\product\11.1.0\client_1\network\admin\listener.ora
# Generated by Oracle configuration tools.

ORCL =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = gep-205.iroda.local)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)

A tnsnnames.ora pedig így:

# tnsnames.ora Network Configuration File: C:\oracle11Clie\product\11.1.0\client_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.231)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = ORCL)
)
)

Mi lehet itt a gond? Nagyon megköszönném, a segítséget.
Ica