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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.
Command protection level denied for policy reasons. 534: Request denied for policy reasons. 535: Failed security check. 536: Data protection level not supported by security mechanism. 537: Command protection level not supported by security mechanism. 550: Requested action not taken. File unavailable (e.g., file not found, no access). 551 ...
This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
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.
[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.
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Turbo coding is an iterated soft-decoding scheme that combines two or more relatively simple convolutional codes and an interleaver to produce a block code that can perform to within a fraction of a decibel of the Shannon limit.