Unreadable error when disabling https WAN admin access


on the control center a warning is shown that admin management is enabled from the WAN, this is correct but I've set a IP ACL on it. However, when I want to disable admin access from the WAN completely by disabling HTTPS on the Local Services ACL page a red warning on the top of the page is shown and immediately disappears. So it's impossible to read. It starts with 'you cannot...' and after the error is gone again, HTTPS under Admin Servies on the WAN is enabled again.