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How To Solve Ora-12541 Tns No Listener ?

How To Solve Ora-12541 Tns No Listener, Check whether the listener is started by running the lsnrctl utility on the Oracle server.

To Start The Lsnrctl Utility:

Select Start - Type Cmd Click Enter
Type Lsnrctl Click Enter
Type Status Click Enter

If The Listener Is Not Started, You Will Get Several Error Messages Starting With TNS.

On Cmd, Type Listener Start And Press Enter.

If the listener has been started and you continue to receive the error message, check that the destination address in the TNSNAMES.ORA file on the client system matches one of the listening addresses listed in the LISTENER.ORA file on the database server.

Did You Restart Listener? Show Us Please The Result Of This Command:

1234<span class="lit">lsnrctl</span><span class="pln"> stop 
lsnrctl start 
lsnrctl status 
lsnrctl services</span>

Connect Descriptor............

12345678<span class="lit">ORCLPDB</span><span class="pln"> </span><span class="pun">=</span><span class="pln">
  </span><span class="pun">(</span><span class="pln">DESCRIPTION </span><span class="pun">=</span><span class="pln">
    </span><span class="pun">(</span><span class="pln">ADDRESS </span><span class="pun">=</span><span class="pln"> </span><span class="pun">(</span><span class="pln">PROTOCOL </span><span class="pun">=</span><span class="pln"> TCP</span><span class="pun">)(</span><span class="pln">HOST </span><span class="pun">=</span><span class="pln"> localhost</span><span class="pun">)(</span><span class="pln">PORT </span><span class="pun">=</span><span class="pln"> </span><span class="lit">1521</span><span class="pun">))</span><span class="pln">
    </span><span class="pun">(</span><span class="pln">CONNECT_DATA </span><span class="pun">=</span><span class="pln">
      </span><span class="pun">(</span><span class="pln">SERVER </span><span class="pun">=</span><span class="pln"> DEDICATED</span><span class="pun">)</span><span class="pln">
      </span><span class="pun">(</span><span class="pln">SERVICE_NAME </span><span class="pun">=</span><span class="pln"> orclpdb</span><span class="pun">)</span><span class="pln">
    </span><span class="pun">)</span><span class="pln">
  </span><span class="pun">)</span>

Now We Have A Question: Which Audience Is Using The Example? If The Database Uses A Listener Other Than The Default, We Can Definitely Check For A Parameter Named LOCAL_LISTENER :

1<span class="lit">Show</span><span class="pln"> </span><span class="typ">Parameter</span><span class="pln"> LOCAL_LISTENER</span>

🔗 Demo Application-
URL- Demo Application
Username - demo, Pass- demo

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Comment on any of your issues, I will try my best to solve the problem, In-Shah Allah. Everyone' s cooperation is desirable.
Visit my blog site, New technology-related videos, you will get different types of tutorials of Oracle Apex, and hopefully, you can use them in your daily work
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