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  2. HTTP 502 - Wikipedia

    en.wikipedia.org/wiki/HTTP_502

    According to the specification, the 502 status code indicates that the server, while acting as a gateway or proxy, received an invalid response from an upstream server. The Occurrence [ edit ]

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The Internet Assigned Numbers Authority (IANA) maintains the official registry of HTTP status codes. [2] All HTTP response status codes are separated into five classes or categories. The first digit of the status code defines the class of response, while the last two digits do not have any classifying or categorization role.

  4. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    502 Command not implemented 503 Bad sequence of commands 504 Command parameter is not implemented 504 5.5.4 Unrecognized authentication type [3] 521 Server does not accept mail [5] 523 Encryption Needed [6] 530 5.7.0 Authentication required [3] 534 5.7.9 Authentication mechanism is too weak [3] 535 5.7.8 Authentication credentials invalid [3]

  5. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

  6. reCAPTCHA - Wikipedia

    en.wikipedia.org/wiki/ReCAPTCHA

    In 2013, reCAPTCHA began implementing behavioral analysis of the browser's interactions to predict whether the user was a human or a bot. The following year, Google began to deploy a new reCAPTCHA API, featuring the "no CAPTCHA reCAPTCHA"—where users deemed to be of low risk only need to click a single checkbox to verify their identity. A ...

  7. List of FTP server return codes - Wikipedia

    en.wikipedia.org/.../List_of_FTP_server_return_codes

    FTP server return codes always have three digits, and each digit has a special meaning. [1] The first digit denotes whether the response is good, bad or incomplete: Range

  8. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    [1]: §7.2 The SIP response codes are consistent with the HTTP response codes, although not all HTTP response codes are valid in SIP. [1]: §21 SIP responses also specify a "reason phrase", and a default reason phrase is defined with each response code.

  9. Reauthenticate your AOL Mail account in third-party email ...

    help.aol.com/articles/reauthenticate-your-aol...

    Click on the video below to see the steps for Mail for Mac. The video will open in a new tab. In Mail on Mac, click Mail and then choose Settings from the menu.; Select your AOL Mail account from the account list.