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system s maximum TCP connection pool is locked in a half-open state, thus denying legitimate traffic to and from the host. To carry out a SYN flood, the attacker creates a spoofed IP packet with an unreachable IP address for a source address, or she clips the receive wire on the Ethernet cable she is using. When the host receives the packet, it responds by sending a SYN/ACK response and waits for the final ACK in the TCP three-way handshake, which never comes. The session will remain in the half-open state until the predefined time-out is reached. This process is repeated until no more TCP sessions are allowed by the host system, which then cannot create any new sessions. More Info

button4 = new Button(">");

See Assessing Network Security (Microsoft Press, 2004) by Kevin Lam, David LeBlanc, and Ben Smith for more information on common attacks on TCP/IP.

The remainder of this section presents several ways you can secure your computers running Windows Server 2003, Windows 2000, and Windows XP against attacks on TCP/IP, including basic TCP/IP binding configurations, custom registry settings, and TCP/IP filtering.

add(button4);

Three basic settings, outlined in the following list, will increase the security of TCP/IP for each network adapter in Windows Server 2003, Windows 2000, and Windows XP. You will need to ensure that each of these settings is compatible with your network and the applications that either run on the computer or must be accessible from the computer.

URL url = null;

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File And Printer Sharing For Microsoft Networks By default, File And Printer Sharing For Microsoft Networks is bound on all network interfaces. The File And Printer Sharing For Microsoft Networks component enables other computers on a network to access resources on your computer. By removing the binding to File And Printer Sharing For Microsoft Networks from a network interface, you can prevent other computers from enumerating or connecting to files and printers that have been shared through that network interface. Stopping the Server service will also prevent a computer from hosting file or print shares. After removing this binding from a network interface, the computer will no longer listen for server Message Block (SMB) connections on TCP port 139 of that interface but will still listen on port 445 for other SMB packets. Direct hosted NetBIOS-less SMB traffic uses port 445 (TCP and UDP). Removing this setting will not interfere with the computer s ability to connect to other shared files or printers. You can unbind File And Printer Sharing For Microsoft Networks in the Network And Dial-Up Connections Control Panel or on the Properties page of the network interface. You can prevent Windows from listening for direct SMB traffic by deleting the default value from the registry entry HKLM\System\CurrentControlSet\Services\NetBT\Parameters\TransportBindName. A host-based firewall, such as Windows Firewall in Windows XP and Windows Server 2003, is also an effective option for preventing other computers from connecting to SMB ports.

try {

19:

NetBIOS Over TCP/IP Windows Server 2003, Windows 2000, and Windows XP support file and printer sharing traffic by using the SMB protocol directly hosted on TCP. This differs from earlier operating systems, in which SMB traffic requires the NetBIOS over TCP/IP (NetBT) protocol to work on a TCP/IP transport. If both the direct-hosted and NetBT interfaces are enabled, both methods are tried at the same time and the first to respond is used. This allows the Windows operating system to function properly with operating systems that do not support direct hosting of SMB traffic. NetBIOS over TCP/IP traditionally uses the following ports: NetBIOS name NetBIOS name NetBIOS datagram NetBIOS session 137/UDP 137/TCP 138/UDP 139/TCP

url = new URL("file:////c://xml//birds//birdsxml");

Direct-hosted NetBIOS-less SMB traffic uses port 445 (TCP and UDP). If you disable NetBIOS over TCP/IP (NetBT) and unbind File And Printer Sharing For Microsoft Networks, the computer will no longer respond to any NetBIOS requests. Applications and services that depend on NetBT will no longer function once NetBT is disabled. Therefore, verify that your clients and applications no longer need NetBT support before you disable it.

catch (MalformedURLException e1) {

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