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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
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 ...
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 ...
481 Call/Transaction Does Not Exist Server received a request that does not match any dialog or transaction. [1]: §21.4.19 482 Loop Detected Server has detected a loop. [1]: §21.4.20 483 Too Many Hops Max-Forwards header has reached the value '0'. [1]: §21.4.21 484 Address Incomplete Request-URI incomplete. [1]: §21.4.22 485 Ambiguous
In cryptography, a message authentication code (MAC), sometimes known as an authentication tag, is a short piece of information used for authenticating and integrity-checking a message. In other words, it is used to confirm that the message came from the stated sender (its authenticity) and has not been changed (its integrity).
Fail-safe means that a device will not endanger lives or property when it fails. Fail-secure, also called fail-closed, means that access or data will not fall into the wrong hands in a security failure. Sometimes the approaches suggest opposite solutions. For example, if a building catches fire, fail-safe systems would unlock doors to ensure ...
Another solution to the desynchronization issue, commonly used in conjunction with client-side prediction, is called server reconciliation. [2] The client includes a sequence number in every input sent to the server, and keeps a local copy. When the server sends an authoritative update to a client, it includes the sequence number of the last ...
Two separate methods were developed to invoke client security for use with FTP clients: Implicit and Explicit.While the implicit method requires that a Transport Layer Security is established from the beginning of the connection, which in turn breaks the compatibility with non-FTPS-aware clients and servers, the explicit method uses standard FTP protocol commands and replies in order to ...