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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

    503 Service Unavailable The server is undergoing maintenance or is temporarily overloaded and so cannot process the request. A "Retry-After" header field may specify when the client may reattempt its request. [1]: §21.5.4 504 Server Time-out

  4. List of SMTP server return codes - Wikipedia

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

    421 Service not available, closing transmission channel (This may be a reply to any command if the service knows it must shut down) 432 4.7.12 A password transition is needed [ 3 ] 450 Requested mail action not taken: mailbox unavailable (e.g., mailbox busy or temporarily blocked for policy reasons)

  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.

  6. Hyper Text Coffee Pot Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Hyper_Text_Coffee_Pot...

    503 Service Unavailable According to Mozilla Developer Documentation, "A combined coffee/tea pot that is temporarily out of coffee should instead return 503", when requested to brew. [ 11 ]

  7. Troubleshoot AOL Calendar problems

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

    Sometimes the old "turn it off and on again" actually works! Restarting your web browser or computer will clear our the internal cache or memory and will often fix most random computer problems.

  8. About error message 'We can't sign you in right now. Please ...

    help.aol.com/articles/error-message-we-cant-sign...

    © 2024 Yahoo. All rights reserved.

  9. List of FTP server return codes - Wikipedia

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

    Service available, closing control connection. This may be a reply to any command if the service knows it must shut down. 425: Can't open data connection. 426: Connection closed; transfer aborted. 430: Invalid username or password 431: Need some unavailable resource to process security. 434: Requested host unavailable. 450: Requested file ...