Gray wifi icon can also mean that wireless network (wifi) is connected, but no Internet connection is present. As someone who works in tech support, I realize a LOT of people don't understand the difference ("No, my Internet is working, it says 'signal strength excellent!!!'") ... but I'm going to assume that most folks here do. Remember the router sits between the Internet and your home network -- being connected to your router via wifi only indicates that the internal communication link between device and router is working...it does not guarantee that the router can get to the Internet.
I realize it's been a few days since the OP made this thread, but the first thing I would do is verify that other devices attached to my router do indeed have access to the Internet. If not, power-cycle your network equipment (router, modems, etc) to see if that fixes it. If you do have working Internet, then I'd investigate the Google services route or see if there's a reason your tablet isn't getting to the Internet.
Gray wifi icon can also mean that wireless network (wifi) is connected, but no Internet connection is present.
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You're not quite correct there. a grey wifi icon on an android device usually means an internet connection, but no connection to Google services. I encountered a problem about a year ago where for about a day my GNex would not connect to anything google related (gmail, calendar, play store, maps, etc), but everything else was connecting just fine. Wifi icon (and the 3G connection as well) were grey bars instead of blue.
I assume you mean CAN be reached, not CAN'T.blue icon indicates Google services can't be reached... which obviously means Internet is available and accessible.
I assume you mean CAN be reached, not CAN'T.
In my experience, a gray wifi icon in notifications means I'm connected to a router, but cannot reach the internet through the router. Blue bars shows I'm connected to a router and can access the internet.
All my other electronics connect and work perfectly with my wifi. I also went to my friends house and tried to connect to her WiFi with my nexus 7 and it still had the gray bars.
Sent from my Galaxy Nexus using Android Central Forums