After upgrading my Sony Xperia Z3 to Lollipop my portable Wi-Fi Internet tethering stopped working – DNS resolution would fail, meaning all connected devices couldn’t use the phone’s Internet. Doh!
I found a fix I thought would be worth sharing if you’re having similar issues and have come across this post looking for help. I have only tested it with my Z3 – it may work for other Android devices, it may not. As always with these things, make sure you backup your phone first.
- Enable developer mode (Go to Settings -> About phone, and press on the build number multiple times until the developer mode is enabled).
- Click back – you should see a new ‘Developer options’ menu entry. Inside this option enable USB debugging
- On a computer, install ‘15 seconds ADB Installer’ – available from the XDA Developers forum here. I selected ‘Yes’ for each install option.
- Connect the phone with a USB cable to the computer, ensuring you press ‘Allow’ to trust your connected computer from the phone
- Open a command prompt (cmd.exe) and navigate to the ‘adb’ folder directory (C:\adb if you installed system-wide – C:\%UserProfile%\adb if it was installed for the current user only). Type, for example: cd C:\adb\
- Start an adb shell by typing the following command: adb shell
- At the adb shell prompt, run this command: settings put global tether_dun_required 0
- Type exit, then disconnect your phone and reboot
This worked for me on the Three UK network but shouldn’t be network operator specific.
Still having issues? A tip from MHawksey in the comments (thanks for sharing!):
You might also need to install your phone’s USB driver http://developer.sonymobile.com/downloads/drivers/
In addition, Paul commented below another fix that may help!
Hi I didn’t need to use your fix all had to do was go to settings then more then mobile networks then access point names then click the 3 dots at the top left corner, a bubble appears saying “reset to default” and tethering is working, two new apns appear one for three (my network) and one under saying “3hotspot”