Comment 6 for bug 132799

Well, honestly there should be two icons:

1) one (blue current one) icon - when Vino server is running and no one is connected
(currently vino 2.24.1 you can choose if you wish to see icon in notification area all the time
vino-preferences, advanced tab, bottom of the window)

2) second (red) icon - if there is active remote desktop user/users