Symptom:
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Cause:
Host IP address is not matched with actual ip address .
Solution :
Match the IP address in /etc/hosts same as ipconfig.
Example :
--cx_oracle module connection to database failed onORA-12514
cx_Oracle.DatabaseError: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
--Check /etc/hosts and ipconfig to see the those ip matches .
--Modify /etc/hosts to match actual ip address .