I installed a new router a few weeks ago. Since then I noticed that the My Messages Icon (yellow triangle, Exclamation mark) was not being shown.
When I tried to view the source of the icon
I got the router blocked website page.
It turns out that if I set the router to Close IM Ports then the router will block based on keyword mymsgs. Any URI which has mymsgs in it will be blocked.
I don't know if others have this problem but it happens with this netgear router.