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Alla of the sudden VPN in on in iOS6 on my iPhone5. It doesn'r help to turn it of in the preferences, because it turns on by itself again. Since this VPN is active it drains my battery, even if I don'r use the telephone. It looses up to 50% over night.
What to do?
Here was my two-step solution.
First, I had Onavo Data Extend installed, which I like the idea of, but ultimately found that it was responsible for holding my VPN continuously connected, even when on my wireless. Think I'll try it again in a few months, once it's updated. Anyways, I went through and deleted it, which unfortunately didn't solve my problem. I found I had to delete the actual profile, so on to my second step!
To completely disable the VPN profile(s):
Go to Settings and turn off VPN. THEN, Settings-->General-->VPN and click on whatever configuration is there. Click the remove button and you should be good to go!
Hope that helps.
I installed Onavo VPN in June but it kept blocking access to *any* websites on Safari. So I removed it... but its VPN remained and stayed on. Turned off VPN and it immediately reconnected. This suggestion from mrgrantmath is the only solution that has worked. I was unaware that I had to go into Settings > General > VPN to actually turn it off.
I can now read web pages on Safari again -- what a nightmare!