Question: Sometimes after I shut off Wi-Fi using the button inside the notification bar drop-down, I can't turn it back on with that button. Hitting the button does nothing, it's not even highlighted. When I go into `Settings -> Wireless and network -> Wi-Fi settings` the status under "Wi-Fi" shows Error. If I click "Wi-Fi" to turn it on from here, it usually turns on without any problems. Occassionally I have to reboot to fix it.

Is there a fix I can use to make the TouchWiz Wi-Fi button work the same as enabling/disabling the Wi-Fi in Settings? Or, ideally, is there some way I can prevent the Wi-Fi from getting into an error state when I turn it off and back on?

I have a Galaxy S Vibrant running 2.2, but this has been reported on other Samsung phones as well ([example](https://android.stackexchange.com/questions/12233/wifi-error-when-turning-on-closed)).

Answer: 
I finally found an easy workaround that does NOT require me to restart my phone.
(After one year of getting annoyed with this Wi-Fi "error" message on a crappy Samsung GT-I5500, running android 2.2)

1. In the Wi-Fi settings screen (where you toggle Wi-Fi on/off), tap your phone's `Menu` button to open a context menu at the bottom of the screen.
2. Click '*Advanced*'
3. Switch the Wi-Fi sleep policy from '*When screen turns off*' to '*Never*'. (I think switching it from *any* setting to *any other* will actually work)

I've been trying this out for a couple of weeks, and turning on the Wi-Fi after doing the above has so far always worked. I've also changed to setting back to 'When screen turns off'. Perhaps leaving it a 'never' will prevent the error from turning up, but I'd like the sleep policy to save some battery.
My belief is that this is a bug in google backing up remembered access points and unnecessarily restoring them. Try long clicking each remembered access point and select forget, next setup each access point password as you reconnect to each (or manually if you remember the ssid).