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5.XXX.XXX Permanent Failure: Not likely to be resolved by resending the message in current form. In general the class identifier MUST match the first digit of the Basic Status Code to which it applies. [1] The subjects are defined as follows: X.0.XXX Other or Undefined Status; X.1.XXX Addressing Status; X.2.XXX Mailbox Status; X.3.XXX Mail ...
Low-density parity-check code, also known as Gallager code, as the archetype for sparse graph codes; LT code, which is a near-optimal rateless erasure correcting code (Fountain code) m of n codes; Nordstrom-Robinson code, used in Geometry and Group Theory [31] Online code, a near-optimal rateless erasure correcting code; Polar code (coding theory)
The server has received a request that requires a negotiated security mechanism, and the response contains a list of suitable security mechanisms for the requester to choose between, [21]: §§2.3.1–2.3.2 or a digest authentication challenge. [21]: §2.4
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.
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 ...
A small number of former TD-2 towers have been brought back to use under third-party ownership. The original New York to Chicago link is one of these. There are two reasons for their re-use, both related to end-to-end time. The first is that signals travel somewhat slower in fiber than through the air, about 200,000 km/s instead of 299,700 km/s.
Notable control messages [8] [9] Type Code Status Description 0 – Echo Reply [2]: 14 0: Echo reply (used to ping) 1 and 2 unassigned: Reserved: 3 – Destination Unreachable [2]: 4 [8] 0: Destination network unreachable 1: Destination host unreachable 2: Destination protocol unreachable 3: Destination port unreachable 4: Fragmentation ...
After the side that sent the first FIN has responded with the final ACK, it waits for a timeout before finally closing the connection, during which time the local port is unavailable for new connections; this state lets the TCP client resend the final acknowledgment to the server in case the ACK is lost in transit.