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I suddenly get into this strange problem. My iPhone has been using the WiFi setup at my home for more than a year. Suddenly it cannot connect to the internet despite still having the full WiFi signal icon.

Have an older iPhone 3 GS and it can still browse the net using the same WiFi. So the wireless router should be working.

When I check the non-functioning iPhone, it has the "Router" and the "DNS" entries blank while the functioning iPhone has entries on both of the fields.

Also the subnet Mask are different.

Please help.

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closed as off topic by Nifle, slhck, Diogo, studiohack♦ Nov 21 '11 at 17:13

Questions on Super User are expected to generally relate to computer software or computer hardware, within the scope defined in the faq.

1 Answer

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To reset a network configuration on iOS:

  • Settings app
  • Wi-Fi
  • Tap the blue arrow icon on the right for the network you are connected to
  • Tap on Forget this Network
  • Try to reconnect to the same network, and if your router supports it, make sure you are using DCHP for your IP Address on your iDevice.

Apple has a great troubleshooting guide here, as well.

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Still doesn't work. When I check the DHCP settings again, all the settings are now blank ... – Stanley Nov 21 '11 at 17:13
Two of the DHCP settings has come back, IP Address and Subnet Mask. The subnet Mask is 255, 255 while the working older phone is 255, 255, 255. The IP Addresses are different. – Stanley Nov 21 '11 at 17:17
Didn't know that phones are off topic. But they indeed interface with my computer since they are used as test devices. But the problem is now solved. Thanks to iglzx who made an effort to help me and his link is useful. – Stanley Nov 22 '11 at 8:13
After spending much time and effort, the solution turned out to be just a simple case of wrong password. The error is missed because the Wireless Router seemed to have accepted the wrong password as good and even send a useless ip mask and an ip address to my phone. It did rejected some wrong password initially before accepting the last one. My only explanation is it is by designed so that its password cannot be found out easily by repeated attempts by some attacking spyware. – Stanley Nov 22 '11 at 8:32
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