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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    203 Non-Authoritative Information (since HTTP/1.1) The server is a transforming proxy (e.g. a Web accelerator) that received a 200 OK from its origin, but is returning a modified version of the origin's response. [1]: §15.3.4 [1]: §7.7 204 No Content The server successfully processed the request, and is not returning any content.

  3. Unreachable code - Wikipedia

    en.wikipedia.org/wiki/Unreachable_code

    As a consequence, err will hold the status of the SHA1 update operation, and signature verification will never fail. [5] Here, the unreachable code is the call to the final function. [6] Applying the Clang compiler with the option -Weverything includes unreachable code analysis, which would trigger an alarm for this code. [6]

  4. Internet Control Message Protocol - Wikipedia

    en.wikipedia.org/wiki/Internet_Control_Message...

    The ICMP header starts after the IPv4 header and is identified by its protocol number, 1. [6] All ICMP packets have an eight-byte header and variable-sized data section. The first four bytes of the header have fixed format, while the last four bytes depend on the type and code of the ICMP packet.

  5. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    221 2.0.0 Goodbye [1] 235 2.7.0 Authentication succeeded [3] 240 QUIT 250 Requested mail action okay, completed 251 User not local; will forward 252 Cannot verify the user, but it will try to deliver the message anyway

  6. Google services outages - Wikipedia

    en.wikipedia.org/wiki/Google_services_outages

    Starting on 24 February 2008 at 18:47 UTC, [1] YouTube was unavailable for around two hours because Pakistan Telecom, a Pakistani telecommunication company, had mistakenly claimed YouTube's IP address space intended to block access to YouTube within Pakistan; the Border Gateway Protocol data was accidentally broadcast to other service providers ...

  7. ICMPv6 - Wikipedia

    en.wikipedia.org/wiki/ICMPv6

    ICMPv6 provides a minimal level of message integrity verification by the inclusion of a 16-bit checksum in its header. The checksum is calculated starting with a pseudo-header of IPv6 header fields according to the IPv6 standard, [6] which consists of the source and destination addresses, the packet length and the next header field, the latter of which is set to the value 58.

  8. Black hole (networking) - Wikipedia

    en.wikipedia.org/wiki/Black_hole_(networking)

    Null routes are typically configured with a special route flag; for example, the standard iproute2 command ip route allows to set route types unreachable, blackhole, prohibit which discard packets. Alternatively, a null route can be implemented by forwarding packets to an illegal IP address such as 0.0.0.0, or the loopback address.

  9. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    If your firewall software isn't on the list linked, you will need to contact your firewall software provider for additional info. Disable Protected Mode in Internet Explorer. Protected mode is enable by default and may interfere with AOL Mail. If you're continuing to have trouble accessing mail, turn Protected Mode off: 1. Click Tools. 2.