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I sometimes use light screen manipulating apps on my galaxy s4(such as twilight app,...) and when the apps are enable,in my vpn apps,ok button in vpn allow connction dialog does not work(cannot be tapped) but cancel button works az usual! I want to know what is the behind?i think this is not a bug, it is something like a rule.

  • Screen overlay apps cause this; this is to prevent malicious overlay from manipulate your operation. – Andy Yan Dec 21 '16 at 0:18
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Your security is the reason

This is to prevent Tapjacking . See bmdixon's answer here Screen overlay detected, what is the problem? for details

So, VPN is not permitted but if you don't have a Cancel option to go back ( and disable the screen app, normally option for this is available in app settings) - how do you go back ? You can't, therefore, Cancel option is NOT greyed out

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