WiFi Error: "Failed to connect to network"

Intermittently, when I try to connect to a WiFi network, I get the following error message as a toast message: > Failed to connect to network The message pops up immediately upon attempting to connect, so clearly it isn't trying and failing. I haven't found any mention of an error in the logs. The affected networks are ones that I've previously connected to with no change in settings. **How can I figure out what the problem is?** I've got a rooted Galaxy Nexus running Android 4.1.1 and the stock ROM. This question is related to another question that I posted earlier , but this one is more about how to find the source of a particular error message, so its focus is different. # Additional Details Here are some more details based on the comments: * I've observed this on my home and work networks. One is identified as WPA2 PSK and the other is identified as WPA/WPA2 PSK. * I haven't powered off the phone as described in the troubleshooting guide mentioned in the comments. However, I have rebooted to no avail (using the reboot command that's available on rooted phones). * Forgetting the network and re-adding it has no effect. In fact, if I forget the network I can no longer successfully re-add it. * The wireless password hasn't changed. * There's no proxy configured when I'm on wireless. However, I run Onavo Extend when I'm on a data connection. Disabling it has no effect. * I've switched from DHCP to static IP addresses. Doing so reduced the frequency of problems and seems to have eliminated my earlier issue where wifi would be randomly dropped. * Wifi sleep is set to "Only when plugged in." I don't think it's relevant because my issue is establishing a connection in the first place (such as when I arrive at home or at work), not maintaining one. Note that despite all these troubleshooting steps,**my initial goal is to find an actual error message or log entry that gives useful information about the problem.**