ORA-12502 TNS-12502 TNS:listener received no CONNECT_DATA from client

TNS:listener received no CONNECT_DATA from clientCause: 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 componentorcl.example.com = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = myserver.example.com)(PORT =…

ORA-12547: TNS:lost contact

This is a quick note to cover ORA-12547: TNS:lost contact error, I would try to include all possible causes of ORA-12547: TNS:lost contact error so that this post itself could assist you in sorting the issue. ORA-12547: TNS:lost contact error could be due to any of the following reasons:- Incorrect permissions on the ORACLE executable.…

Listener Issues ORA-12505/TNS-12505 or ORA-12514/TNS-12514

This post details how to resolve listener connection issues when DB & listener are started but still connect fails with following errors:- ORA-12505 TNS:listener could not resolve SID given in connect descriptor TNS-12505 TNS:listener could not resolve SID given in connect descriptor ORA-12514 TNS:listener could not resolve SERVICE_NAME given in connect descriptor TNS-12514 TNS:listener could…