I was recently in Paris for a few days and while there I tried to connect my device to the free Wifi network that the municipality provides. But failed every single time and at different locations. The hotspot came up as connected but when I tried to open a browser I got no connection, just an error message "bad ssl mac", or something to that effect.
I'm not there any more and probably won't be there again any time soon. Just wanted to document this problem.