I have noticed for some time that the shared screen icon flickers on and off on my menubar every couple of minutes (MacBook Pro, MAC OS X 10.8.4). I thought it was a glitch or a bug. I've checked the console and there are connection attempts almost every minute. 99% are from a specific address:
26/07/13 00:41:51,569 screensharingd: Authentication: FAILED :: User Name: N/A :: Viewer Address: 126.96.36.199 :: Type: VNC DES
Is this a brute force attack? Should I be concerned? I do need Screen Sharing on, as I connect to this mac quite frequently. I considered activating the Firewall, but it won't help unless I block all incoming connections.
Is there a way to block that IP from connecting at all. The mac is behind an airport extreme router with VNC ports pointed to this mac by NAT. Any way to filter those connections at that level?