I'm using Sony Xperia Z2, after updated to lollipop 5.1.1 my wifi is not working in spite of a good connection due to that exclamation mark. I read so many related posts and answers here, but i don't understand the technical term/way to solve this problem. I kindly request to explain me in a very simple step-by-step procedure. Thanks
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First of all, the exclamation mark is not what causes your WiFi not to work, it's the other way round; the exclamation mark is there to show that your WiFi is not working. – shyam Sep 30 '15 at 04:25
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What type of wireless network are you trying to connect to (private, home, public, etc.)? Did the Wi-Fi work normally before the update to 5.1.1? How did you perform this update? – paulmz Sep 30 '15 at 15:04
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Can you connect to the internet via the same WiFi connection from another device? If you can, does forgetting the WiFi network then connecting again solve the issue? – MorrisIriga Oct 23 '15 at 11:08