After you define your system connections, you can activate a connection from the connection status bar, which is in the lower-right corner of the workbench.
The z/OS® Explorer attempts to connect to the system indicated in the system connection status bar. If you did not previously enter your password or pass phrase, you are asked to enter it now.
If the connection is successful, the connection name appears in the connection status bar, which is in the lower right corner of the workbench. The connection icon is green for a non-SSL connection, or a padlock icon for a SSL connection.
If the connection is not successful, the connection name appears in the connection status bar, which is in the lower right corner of the workbench. The connection status icon is red, indicating that the connection was not successful. An error message is displayed providing a reason for the failure. Check the values in the fields, correct any errors in the connection definition , and click Connect to test the corrections.