How an existing connection of work can begin to fail with 'not in measure to establish a connection to network adapter?

I can't get my previous database connection called system_connection_orcl to connect.  I don't understand why all of a sudden a connection that has worked is having this problem at random.  A few times, it connects well, other times, it's not.   I have internet on this operational computer.


Login name: system_connection_orcl

Username: System

Password: [password]

Save password: Yes

Connection type: basic

Role: by default

Host name: localhost

Port: 1521

SID: orcl


Then I click 'TEST', and it returns the following error:

Status: Failed - Test has failed: IO error: the network adapter could not establish the connection.

Hi 2998741,

At 12.1.0.2 (you seem to be on your banner lsnrctl) simply:

MODIFY a PLUG-IN pdb1 SAVE DATABASE STATE;

which seems simpler than a trigger.

Turloch

SQLDeveloper - forum

Tags: Database

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