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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API). 502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from the upstream server. 503 Service Unavailable

  3. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    (Compare with 405 Method Not Allowed, where the server recognizes the method but does not allow or support it.) [1]: §21.5.2 502 Bad Gateway The server is acting as a gateway or proxy, and received an invalid response from a downstream server while attempting to fulfill the request. [1]: §21.5.3 503 Service Unavailable

  4. List of SMTP server return codes - Wikipedia

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

    501 5.7.0 Client initiated Authentication Exchange (only when the SASL mechanism specified that client does not begin the authentication exchange) [3] 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 ...

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

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

    When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you. These messages are sent automatically and often include the reason for the delivery failure.

  6. List of FTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_FTP_server_return...

    A rule of thumb in determining if a reply fits into the 4xx or the 5xx (Permanent Negative) category is that replies are 4xx if the commands can be repeated without any change in command form or in properties of the User or Server (e.g., the command is spelled the same with the same arguments used; the user does not change his file access or ...

  7. Troubleshoot AOL Calendar problems

    help.aol.com/articles/aol-calendar-troubleshooting

    Sometimes, a change in the calendar's color can cause the issue with its functionality. Changing it back to the default color can reset everything and get it working again.

  8. 503 (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/503_(disambiguation)

    503 may refer to: 503 (number) 503, a year; 503, a track by Hans Zimmer on the Angels & Demons soundtrack; 503 Service Unavailable, an HTTP status code; Area code 503, a North American telephone area code in northwestern Oregon; BMW 503, a grand tourer; Fiat 503, a small family car; Country code +503, for El Salvador

  9. Mercury Goes Retrograde Before Thanksgiving. An Astrologer ...

    www.aol.com/mercury-goes-retrograde-thanksgiving...

    Mercury going retrograde means a few different things, depending on how you look at it. In astronomy (i.e. the study of celestial objects), a planet is in retrograde when it looks like it’s ...