Oracle On Windows - ORA-12560: TNS:protocol adapter error

Oracle On Windows - ORA-12560: TNS:protocol adapter error

Issue: 

Unable to connect to database getting error ORA-12560: TNS:protocol adapter error

C:\Users\Administrator>set ORACLE_HOME=E:\app\mallik\product\19.0.0.0\dbhome_1

C:\Users\Administrator>set ORACLE_SID=ORA19C

C:\Users\Administrator>E:\app\mallik\product\19.0.0.0\dbhome_1\bin\sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Wed Jul 31 23:00:31 2024

Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

ERROR:

ORA-12560: TNS:protocol adapter error

Enter user-name:

ERROR:

ORA-12560: TNS:protocol adapter error

Enter user-name:

ERROR:

ORA-12560: TNS:protocol adapter error

SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus

C:\Users\Administrator>

Cause:

Windows service will be down -  OracleServiceORA19C

Solution or Fix:

Verify the windows service status for Oracle and restart them