title: ORA-12560: TNS:protocol adaptor error
body: <p><img src="https://i.stack.imgur.com/JLGWa.png" alt="enter image description here"></p>
  
  <p>I Google[d] for this error <strong>ORA-12560: TNS:protocol adaptor error</strong> but not able to find the actual reason and how to solve this error ?</p>
  
  <p>Can anyone tell me a perfect solution to solve login problem.</p>