ORA-12560: TNS:protocol adaptor error

Question

Go to the windows machine that hosts the Oracle database server
Go to Start -> Run -> Services.msc in Windows.
Locate OracleService < SID > (here OracleServiceORCL) and click on Start to start the oracle database service (if not already running)
Once it is up and running, from the command prompt run the following:
```
tnsping < tnsalias > 
```
(tnsalias entry you can find it in tnsnames.ora file)