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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
If you use a 3rd-party email app to access your AOL Mail account, you may need a special code to give that app permission to access your AOL account. Learn how to create and delete app passwords. Account Management · Apr 17, 2024
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.
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)
Fastly, which has been widely reported as the source of the problem, updated its service status page, saying: “The issue has been identified and a fix is being implemented.”
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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
The common "Wikimedia Foundation error" message (WFEM) is sometimes called a "server error" but might be caused by a recent edit which a user made to the current page being displayed. The message is an indication that the webpage being processed for display could not be completely formatted within the time allotted, typically 60 seconds.