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.
Try to login your VPN now, it should probably work. If not, use whatever last resort you have. But remember to backup first :P