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When received in response to a POST (or PUT/DELETE), the client should presume that the server has received the data and should issue a new GET request to the given URI. 304 Not Modified Indicates that the resource has not been modified since the version specified by the request headers If-Modified-Since or If-None-Match. In such case, there is ...
The server attempted to access another server in attempting to process the request, and did not receive a prompt response. [1]: §21.5.5 505 Version Not Supported The SIP protocol version in the request is not supported by the server. [1]: §21.5.6 513 Message Too Large The request message length is longer than the server can process.
535 5.7.8 Authentication credentials invalid [3] 538 5.7.11 Encryption required for requested authentication mechanism [3] 550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons) 551 User not local; please try <forward-path> 552 Requested mail action aborted: exceeded ...
The requested action is being initiated; expect another reply before proceeding with a new command. (The user-process sending another command before the completion reply would be in violation of protocol; but server-FTP processes should queue any commands that arrive while a preceding command is in progress.)
This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight bits wide.
The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.
Explicit Congestion Notification (ECN) is an extension to the Internet Protocol and to the Transmission Control Protocol and is defined in RFC 3168 (2001). ECN allows end-to-end notification of network congestion without dropping packets. ECN is an optional feature that may be used between two ECN-enabled endpoints when the underlying network ...
The X.500 protocols traditionally use the OSI networking stack. However, the Lightweight Directory Access Protocol uses TCP/IP for transport. In later versions of the ITU Recommendation X.519, the Internet Directly-Mapped (IDM) protocols were introduced to allow X.500 protocol data units (PDUs) to be transported over the TCP/IP stack.