Thanks for your help adewri

Everything worked till I changed it to one listener. I configured my ora92 listerer like this so that I could eliminate 803 listener. Now I am getting ora-12500 again if I connect to 803 from 92sqlplus.

# LISTENER.ORA Network Configuration File: D:\ora92\network\admin\listener.ora

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.50.37)(PORT = 1521)
)
)
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(Host = 172.18.50.37)(Port = 1526)
)
)

)
)

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = TEST92)
(ORACLE_HOME = D:\ora92)
)
(SID_DESC =
(SID_NAME = DCC1)
(ORACLE_HOME = C:\ORANT)
)
)

# TNSNAMES.ORA Network Configuration File: D:\ora92\network\admin\tnsnames.ora
DCC1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.50.37)(PORT = 1526)
)
)
(CONNECT_DATA = (SID = DCC1)
)
)

TEST92 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.50.37)(PORT = 1521)
)
)
(CONNECT_DATA = (SERVICE_NAME = TEST92)
)
)

I did put TNS_ADMIN to ora92 tnsnames.ora