I have a Vista HP T4400 that has started having trouble with the system tray network icon - at least. When I boot the machine, the icon for network connections in the system tray shows the globe icon indicating local and internet access and the bubble "Local and Internet access" appears when I hover over it. I can access web and email services. After a few minutes - sometimes longer, the icon loses the global and the text shows "Local Only". However, I can still access the internet on my browser and I still get email. It appears that some things (like syncing with Windows Live) aren't working correctly though.
I have rebooted the router (FIOS-based Verizon service) and have rebooted the machine many times checking individual programs. Repair does not detect and issue. Disabling and re-enabling does not change the status. I have turned off IPv6. Still same issue.