// anything that should not be there.
ISecurePreferences root = SecurePreferencesFactory
.getDefault();
ISecurePreferences node = root
.node(IPHPDebugConstants.SSH_TUNNEL_SECURE_PREF_NODE);
String[] listedHosts = node.childrenNames();
// For each host that we have in the secured storage, check
// that it's existing in the launch configurations and that
// it contains
// only the user names that are defined.
// In any other case, remove the item from the storage (a