ORA-12560:TNS:Protocol Adapter Error, When Trying To Connect Into Oracle Database Using ODBC or OLEDB

[Daniel_Seo]

Connecting the QlikView Directory Service connector using OLDBC or OLEDB shows the following error:

ORA-12560:TNS:protocol adapter error, Oracle classify this as a 'generic protocol adapter error 

This indicates that Oracle client does not know what instance to connect to or what TNS alias to use.

 Cause:

Oracle classify this as a 'generic protocol adapter error'.  it indicates that Oracle client does not know what instance to connect to or what TNS alias to use.

• Oracle client is not installed on Qlik product server
• Oracle Listener or database is not up
• TNSNAMES.ora has a problem
• Connection between Oracle client and server has problem (TCP/IP or network side)
• ORCL 2019.3: the SQLNET.ora has AUTHENTICATION set to TNS. Changing it to (NONE) may help with starting the Listener. 

Resolution:

This error is being shown by Oracle and as of such, we recommend contacting the Oracle administrator.

Previous cases related to the issue have been resolved following these troubleshooting steps:

Check the listener status:

Go to a command prompt on the Oracle database server and run

C:\>  lsnrctl status

Verify that the tnsnames entry is correct:

Go to a command prompt on the Qlik Product server and run

C:\> tnsping INSTANCENAME

Check the connection between Oracle client and database server:

Go to a command prompt on the Qlik Product server and run

C:\Document and settings\ORANGE> cd\
C:\> set oracle_sid=<DB name>

e.g   C:\> set oracle_sid=<rajesh> {press enter}
      C:\> sqlplus /nolog {press enter}
sql:\>connect sys/sys as sysdba {press enter} it cant ask for password directly connected
    or
sql:\>connect sys as sysdba {press enter}
password : sys {press enter}
sql:\> connected
       or
sql:\> connect scott {press enter}
Enter password :tiger {press enter}
sql:\> connected
     or
sql:\> connect system {press enter}
Enter password :manager {press enter}
sql:\> connected