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  2. Fail-safe - Wikipedia

    en.wikipedia.org/wiki/Fail-safe

    Fail-secure, also called fail-closed, means that access or data will not fall into the wrong hands in a security failure. Sometimes the approaches suggest opposite solutions. For example, if a building catches fire, fail-safe systems would unlock doors to ensure quick escape and allow firefighters inside, while fail-secure would lock doors to ...

  3. Electric strike - Wikipedia

    en.wikipedia.org/wiki/Electric_strike

    Fail-secure. Also called fail-locked or non-fail safe. In this configuration, applying electric current to the strike will cause it to unlock. In this configuration, the strike would remain locked in a power failure, but typically the mechanical lock can still be used to open the door from the inside for egress from the secure side.

  4. Fault tolerance - Wikipedia

    en.wikipedia.org/wiki/Fault_tolerance

    A system that is designed to fail safe, or fail-secure, or fail gracefully, whether it functions at a reduced level or fails completely, does so in a way that protects people, property, or data from injury, damage, intrusion, or disclosure.

  5. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    The most common reason for a failed delivery is that the email address entered isn't valid. If the delivery failure message says the account doesn't exist double check the spelling of the address you entered. A single misplaced letter could cause a delivery failure.

  6. Single point of failure - Wikipedia

    en.wikipedia.org/wiki/Single_point_of_failure

    The concept of a single point of failure has also been applied to fields outside of engineering, computers, and networking, such as corporate supply chain management [6] and transportation management. [7] Design structures that create single points of failure include bottlenecks and series circuits (in contrast to parallel circuits).

  7. How email spoofing can affect AOL Mail - AOL Help

    help.aol.com/articles/what-is-email-spoofing-and...

    A compromised (hacked) account means someone else accessed your account by obtaining your password. Spoofed email occurs when the "From" field of a message is altered to show your address, which doesn't necessarily mean someone else accessed your account. You can identify whether your account is hacked or spoofed with the help of your Sent folder.

  8. Fix issues with AOL Mail image challenges

    help.aol.com/articles/what-should-i-do-if-i-get...

    AOL Mail uses many security measures to keep your account secure, one of which is CAPTCHA or image challenges when sending mail. These challenges exist to make it harder for hackers to access your accounts. The characters can't be read by a computer and must be entered manually, ensuring only a real person can pass the test. Why am I being ...

  9. Wikipedia:Fail Safe - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Fail_Safe

    When that happens, the system has failed, in that particular instance -- failed to provide resources (time, usually) to do the thing properly. In engineering, a fail-safe is a practice that, in the event of a specific type of failure, inherently responds in a way that will cause least harm to the system or to people.