The NO listener error occurs during PLSQL developer login.

ORA-12541: TNS: No listener

Since PLSQL developer was unable to log on to Oracle, it was long before people wanted to study this database, but they had no time to study it.

I used to use the client PLSQL developer, there is no problem, but today when starting PLSQL developer, there is always "ORA-12541: TNS: No

Listener "problem, found the solution on the Internet:

Start --> Oracle InstallationProgramAccording to --> net configuration Assistant

Select Listener Configuration --> next --> Add (generally, the server is vulnerable to problems, so Add a new listener) --> Add listener

Name (generally, the name of the database to be accessed is used as the listener name) --> select TCP --> select default. Return to the logon page, --> select a local net name.

Service configuration --> select "reconfigure" --> select the Net Name (generally the global database name) --> enter the local IP address, select the default one, and then enter the local IP address.

To restart the service.