I've had that sometimes, and I need to resend my service books for it to work again. Resending service books and pulling battery solves most problems! Glad it was only the password for you though!
I had the same problem with my WiFi yesterday so I called customer service.
They told me to do a battery pull with the phone power on. I also
read on here to resend your service books. I did both and mine is working fine....for now!
Try both and see if this helps! Good Luck!
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I had this problem until yesterday. It happened for two days straight. What I did was I re loaded the OS and then resent service books and did a battery pull and worked.
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I too pulled the batter and resent service books and all is working fine. Even when the wifi was not working it still showed that it had an IP and MAC address but did not have the green check mark next to the wifi list. Just hopig this won't be a regular occurance.....
I have been dealing with this for 2 days now. Same problem shows my network but no check mark. Pulled the battery, resent service books many,many times. I entered the IP manually, I'm lost for now.