ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

Items Checked

TNS_ADMIN environment variable is defined as "D:\app\client\tech_aot\product\12.2.0\client_1\network\admin"

"D:\app\client\tech_aot\product\12.2.0\client_1\network\admin\tnsnames.ora" was located

The following connect descriptor was found for KAP in the tnsnames.ora file

KAP =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.68.32.128)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = KAP)
    )
  )

"D:\app\client\tech_aot\product\12.2.0\client_1\network\admin\sqlnet.ora" was located

NAMES.DIRECTORY_PATH specifies TNSNAMES in the sqlnet.ora file

Steps to Take
If the database was just started wait a few moments and try again as the database may be initializing
Verify that the connect descriptor for KAP has the correct SERVICE_NAME or SID component in the tnsnames.ora file
Verify that the listener is properly configured and that the database is registered with the listener
Try to ping 10.68.32.128 using the Ping button on the toolbar
Try to TNSPing KAP using the TNS Ping button on the toolbar