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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.

  3. Transmission Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Transmission_Control_Protocol

    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.

  4. Address Resolution Protocol - Wikipedia

    en.wikipedia.org/wiki/Address_Resolution_Protocol

    v. t. e. The Address Resolution Protocol ( ARP) is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address. This mapping is a critical function in the Internet protocol suite.

  5. Troubleshoot a broadband internet connection - AOL Help

    help.aol.com/articles/troubleshooting-a...

    2. Check the physical connection - A loose cable or cord can often be the cause of a connection problem. Make sure everything is securely connected to the wall and device. 3. Reboot your modem/router - Sometimes the old "turn it off and on again" approach actually does work! Just wait about five minutes before turning it back on to make sure ...

  6. List of TCP and UDP port numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

    This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist.

  7. Fix problems reading or receiving AOL Mail

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

    Make sure the option "Block All Senders Except Contacts" under "Mail Settings --> Block Senders" is unchecked. If checked, you will not receive messages from anyone not in your contacts. Messages are often delivered right way though very rarely there may be a delay in transit. This is usually due to problems on the mail server, heavy internet ...

  8. GPRS Tunnelling Protocol - Wikipedia

    en.wikipedia.org/wiki/GPRS_Tunnelling_Protocol

    v. t. e. GPRS Tunnelling Protocol ( GTP) is a group of IP -based communications protocols used to carry general packet radio service (GPRS) within GSM, UMTS, LTE and 5G NR radio networks. In 3GPP architectures, GTP and Proxy Mobile IPv6 based interfaces are specified on various interface points. GTP can be decomposed into separate protocols ...

  9. Air gap (networking) - Wikipedia

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

    An air gapped network (right) with no connection to a nearby internet-connected network (left) An air gap, air wall, air gapping [1] or disconnected network is a network security measure employed on one or more computers to ensure that a secure computer network is physically isolated from unsecured networks, such as the public Internet or an unsecured local area network. [2]