Just got a new Zyxel USG 300 and configured, did some moving of cables.
Have this issue now where any user can get emails, internal files, print, in fact all looks normal, except we have that annoying ! on the network adapter icon and "no internet access" error. And there is no internet.
Very odd issue as it eventually goes away and seems to randomly strike workstations, Win 7 and XP. The only pattern I've seen is when rebooting. Those computers are most affected.
I'm inclined to think it's the firewall, however, the server SBS 2011 is behind the firewall as are the workstations.
Any suggestions?