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After a reboot, I cannot configure my normal VPN connection, nor modify some Operating System security settings.

What can prevent me from making changes to security settings? Malware?

  • Should this question be closed? Or rewritten in a format of question: vague but index- & search-able observations with an answer: description of underlying issue and solution for that issue. – mcint May 25 '15 at 23:44
  • No need to close the question. You did a good job following SE's Q&A format. This might be useful for future readers. – Andrew T. May 27 '15 at 10:34
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Applications which interfere with screen appearance can prevent a user from makes changes to security settings while the app is active.

The operating system has to be careful to prevent a 3rd-party application from having influence over security settings by changing the appearance of security options to the user. (best guess speculation)

A screen-color-changing app, Twilight, may have been active, and therefore, from a Security Manager's point of view, able to influence a user's input to system security settings menus.

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