I'm currently having this same issue. I keep editing the initial Setup to read Yes, but still see: Sorry But Front Entrance is currently down for maintenance.
The Yes defaults back to No. I have also tried to set up page Layout and it reverts as well.
editconfigpal.php I set to 666, won't save, tried 777, still no save.
It's a fresh, clean install of threads 6.5 and IIP 6.5
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