I'm unable to connect my phone to VPN, it always say "unsuccessful". I deleted the profile and created it again but it didn't help. What is wrong with it?
The only surefire fix I can suggest is factory reset. But I know it should be your last resort so maybe it can also be fixed by resetting the settings to defaults, without losing data. This method sometimes work with broken wifi, issues with force close, some lagging issue and some others.
First, if you have Titanium Backup or other similar apps, backup your system data (Settings, ApplicationSettings, Settings Storage) because you will be wiping it clean.
2nd, Go to Settings -> Applications -> All, and scroll down until you find
Settings. Select it, now you will see some info, scroll down until so see
Clear data. Note that clearing data will set your Wifi, Wallpaper, Sound, Network, but not your password and google login, to defaults.
Now after clearing Settings, go back to Applications -> All, and check if you also have
Network Provider there, clear its data too to be sure.
Try to login your VPN now, it should probably work. If not, use whatever last resort you have. But remember to backup first :P