Connecting to MySQL in DbVisualizer 12.0.6 may result in the following error:
"The last packet successfully received from the server was 1 milliseconds ago. The last packet sent successfully to the server was 1 milliseconds ago."
The error is most likely due to SSL protocols that has been removed in the version of Java that is used for DbVisualizer.
To fix this set the following driver property under the Properties tab for your MySQL connection and in the Driver Properties category:
Click Apply and then connect.