ORA-12502 TNS-12502 TNS:LISTENER RECEIVED NO CONNECT_DATA FROM CLIENT
TNS:listener received no CONNECT_DATA from client
Cause:No CONNECT_DATA was passed to the listener.
Action: Check that the service name resolved from TNSNAMES.ORA has the CONNECT_DATA component of the connect descriptor.
Below is the sample entry of tnsnames.ora:-
#When using SERVICE_NAME in CONNECT_DATA component
orcl.example.com =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = myserver.example.com)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)
#When using SID in CONNECT_DATA component
orcl.example.com =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = myserver.example.com)(PORT = 1521))
)
(CONNECT_DATA =
(SID = orcl)
)
)
