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  2. Fatal system error - Wikipedia

    en.wikipedia.org/wiki/Fatal_system_error

    If the user has enabled it, the system will also write an entry to the system event log. The log entry contains information about the bug check (including the bug check code and its parameters) as well as a link that will report the bug and provide the user with prescriptive suggestions if the cause of the check is definitive and well-known.

  3. Byzantine fault - Wikipedia

    en.wikipedia.org/wiki/Byzantine_fault

    A Byzantine fault is a condition of a system, particularly a distributed computing system, where a fault occurs such that different symptoms are presented to different observers, including imperfect information on whether a system component has failed.

  4. Redundancy (engineering) - Wikipedia

    en.wikipedia.org/wiki/Redundancy_(engineering)

    In a triply redundant system, the system has three sub components, all three of which must fail before the system fails. Since each one rarely fails, and the sub components are designed to preclude common failure modes (which can then be modelled as independent failure), the probability of all three failing is calculated to be extraordinarily ...

  5. Exit status - Wikipedia

    en.wikipedia.org/wiki/Exit_status

    In OpenVMS, success is indicated by odd values and failure by even values. The value is a 32-bit integer with sub-fields: control bits, facility number, message number and severity. Severity values are divided between success (Success, Informational) and failure (Warning, Error, Fatal). [9]

  6. Identify legitimate AOL websites, requests, and communications

    help.aol.com/articles/identify-legitimate-aol...

    Applications officially supported by AOL go through an industry-standard vetting process that offers a clear, obvious authentication known as OAuth 2.0. What to watch out for • Spoofing - used by spammers to make an email or website appear as if it's from someone you trust.

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

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

    A single misplaced letter could cause a delivery failure. If the message keeps getting bounced back, make sure the account is closed or hasn't been moved. Each delivery failure message will provide info on when the original email was sent ("Arrival-Date"), the reason for the failure ("This user doesn't have a aol.com account (XXX123@aol.com ...

  8. Why am I asked to verify my account after signing in?

    help.aol.com/articles/why-am-i-asked-to-verify...

    If there's something unusual about your sign in or recent activity, we'll ask you to go through another verification step after you've entered the correct password.

  9. State machine replication - Wikipedia

    en.wikipedia.org/wiki/State_machine_replication

    In a system with no failures, the Inputs may be discarded after being processed by the State Machine. Realistic deployments must compensate for transient non-failure behaviors of the system such as message loss, network partitions, and slow processors. [14] One technique is to store the series of Inputs in a log.