When you have defined your system connections you can activate a connection from the connection status bar in the lower right corner of the workbench window.
If the connection is successful, the connection name appears in the connection status bar in lower right corner of the workbench window next to a green icon for a non-SSL connection, or a padlock icon for a SSL connection, . The CICS systems in the current scope are shown in the CICSPlex® Explorer view.
If the connection is not successful, the connection name appears in the lower right corner of the workbench window next to a red icon, 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.