Solution :
Try changing your ORA properties.
ORA11gR23 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS =
(PROTOCOL = TCP)
(HOST = orasrv-alanb-lx06)
(PORT = 1521)
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORA11gR23)
)
)
)
ORA11gR23 =
(DESCRIPTION =
(ADDRESS =
(PROTOCOL = TCP)
(HOST = orasrv-alanb-lx06)
(PORT = 1521)
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORA11gR23)
)
)
your SERVICE_NAME = ORA11gR23 should match the name you have given before description.
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