The same thing happened with my Turbo with my work WiFi, but I finally figured it out. When the red padlock is on the screen tap the 3 dots on the top right of the screen. One of the options is something such as "proceed anyway with this network as is." The first time it does nothing, then the screen pops up again after a few seconds, then pick the same option to proceed anyway again. I think mine did this 3 times before another screen finally came up and gave me a warning that the network was not secure and it was dangerous to proceed. I did it anyway, then I was connected to the work WiFi. Not sure why the Turbo has to go through all these warnings. I thought mine was the only one that did this, but the solution here has got me connected several times.