Connected By Tcp Hack

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  • Oct 03, 2017.
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Definition

Connects the client to a remote TCP host using the specified host name and port number.

Overloads

Connect(IPEndPoint)

Connects the client to a remote TCP host using the specified remote network endpoint.

Connect(IPAddress, Int32)

Connects the client to a remote TCP host using the specified IP address and port number.

Connect(IPAddress[], Int32)

Connects the client to a remote TCP host using the specified IP addresses and port number.

Connect(String, Int32)

Connects the client to the specified port on the specified host.

Connects the client to a remote TCP host using the specified remote network endpoint.

Parameters

remoteEP
IPEndPoint

The IPEndPoint to which you intend to connect.

Exceptions

The remoteEp parameter is null.

An error occurred when accessing the socket.

The TcpClient is closed.

Examples

The following code example uses an IPEndPoint to connect with a remote host.

Remarks

Call this method to establish a synchronous remote host connection to the specified IPEndPoint. Before you call Connect, you must create an instance of the IPEndPoint class using an IP address and a port number. Use this IPEndPoint as the remoteEP parameter. The Connect method will block until it either connects or fails. After connecting with the remote host, use the GetStream method to obtain the underlying NetworkStream. Use this NetworkStream to send and receive data.

Note

If you receive a SocketException, use SocketException.ErrorCode to obtain the specific error code. After you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Note

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework

See also

Connected By Tcp Hacker

Connects the client to a remote TCP host using the specified IP address and port number.

Parameters

address
IPAddress

The IPAddress of the host to which you intend to connect.

port
Int32

The port number to which you intend to connect.

Exceptions

The address parameter is null.

The port is not between MinPort and MaxPort.

An error occurred when accessing the socket.

TcpClient is closed.

Examples

The following code example uses an IP Address and port number to connect with a remote host.

Remarks

Call this method to establish a synchronous remote host connection to the specified IPAddress and port number. The Connect method will block until it either connects or fails. After connecting with the remote host, use the GetStream method to obtain the underlying NetworkStream. Use this NetworkStream to send and receive data.

Note

If you receive a SocketException, use SocketException.ErrorCode to obtain the specific error code. After you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Note

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

See also

Connects the client to a remote TCP host using the specified IP addresses and port number.

Parameters

ipAddresses
IPAddress[]

The IPAddress array of the host to which you intend to connect.

port
Int32

The port number to which you intend to connect.

Exceptions

The ipAddresses parameter is null.

The port number is not valid.

An error occurred when attempting to access the socket.

The Socket has been closed.

A caller higher in the call stack does not have permission for the requested operation.

This method is valid for sockets that use the InterNetwork flag or the InterNetworkV6 flag.

Examples

The following code example uses an IP Address and port number to connect with a remote host.

Remarks

This method is typically used immediately after a call to the BeginGetHostAddresses method, which can return multiple IP addresses for a single host. Call the Connect method to establish a synchronous remote host connection to the host specified by the array of IPAddress elements and the port number. The Connect method will block until it either connects or fails. After connecting with the remote host, use the GetStream method to obtain the underlying NetworkStream. Use this NetworkStream to send and receive data.

Note

Hacking

If you receive a SocketException, use SocketException.ErrorCode to obtain the specific error code. After you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Note

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

See also

Connects the client to the specified port on the specified host.

Parameters

hostname
String

The DNS name of the remote host to which you intend to connect.

port
Int32

The port number of the remote host to which you intend to connect.

Exceptions

The hostname parameter is null.

The port parameter is not between MinPort and MaxPort.

An error occurred when accessing the socket.

Tcp Connected Light Bulbs

TcpClient is closed.

Examples

The following code example uses the host name and port number to connect with a remote host.

Remarks

Call this method to establish a synchronous remote host connection to the specified host name and port number. The Connect method will block until it either connects or fails. After connecting with the remote host, use the GetStream method to obtain the underlying NetworkStream. Use this NetworkStream to send and receive data.

If IPv6 is enabled and the Connect(String, Int32) method is called to connect to a host that resolves to both IPv6 and IPv4 addresses, the connection to the IPv6 address will be attempted first before the IPv4 address. This may have the effect of delaying the time to establish the connection if the host is not listening on the IPv6 address.

Note

If you receive a SocketException, use SocketException.ErrorCode to obtain the specific error code. After you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Note

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

See also

Applies to

As an ethical hacker, you should glean as much information as possible after scanning your systems. Determine what’s running on your open ports. You can often identify the following information:

  • Protocols in use, such as IP, IPX, and NetBIOS

  • Services running on the hosts, such as e-mail, web servers, and database applications

  • Available remote access services, such as Remote Desktop Protocol (RDP), Virtual Network Computing (VNC), and Secure Shell (SSH)

  • Virtual Private Network (VPN) services, such as PPTP, SSL, and IPsec

  • Required authentication for network shares

You can look for the following sampling of open ports (your network-scanning program reports these as accessible or open):

  • Ping (ICMP echo) replies, showing that ICMP traffic is allowed to and from the host

  • TCP port 21, showing that FTP is running

  • TCP port 23, showing that telnet is running

  • TCP ports 25 or 465 (SMTP and SMPTS), 110 or 995 (POP3 and POP3S), or 143 or 993 (IMAP and IMAPS), showing that an e-mail server is running

  • TCP/UDP port 53, showing that a DNS server is running

  • TCP ports 80, 443, and 8080, showing that a web server or web proxy server is running

  • TCP/UDP ports 135, 137, 138, 139 and, especially, 445, showing that an unprotected Windows host is running

Thousands of ports can be open — 65,534 each for both TCP and UDP, to be exact. A continually updated listing of all well-known port numbers (ports 0–1023) and registered port numbers (ports 1024–49151), with their associated protocols and services, is located at www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt. You can also perform a port-number lookup at www.cotse.com/cgi-bin/port.cgi.

Connected By Tcp Hack

If a service doesn’t respond on a TCP or UDP port, that doesn’t mean it’s not running. You may have to dig further to find out.

If you detect a web server running on the system that you test, you can check the software version by using one of the following methods:

  • Type the site’s name followed by a page that you know doesn’t exist, such as www.your_domain.com/1234.html. Many web servers return an error page showing detailed version information.

  • Use Netcraft’sWhat’s that site running? search utility, which connects to your server from the Internet and displays the web server version and operating system.

You can dig deeper for more specific information on your hosts:

  • NMapWin can determine the system OS version.

  • An enumeration utility (such as DumpSec) can extract users, groups, and file and share permissions directly from Windows.

  • Many systems return useful banner information when you connect to a service or application running on a port. For example, if you telnet to an e-mail server on port 25 by entering telnet mail.your_domain.com 25 at a command prompt, you may see something like this:

    Most e-mail servers return detailed information, such as the version and the current service pack installed. After you have this information, you (and the bad guys) can determine the vulnerabilities of the system.

  • A share-finder tool, such as the one built in to GFI LanGuard, can find open Windows shares.

  • An e-mail to an invalid address might return with detailed e-mail header information. A bounced message often discloses information that can be used against you, including internal IP addresses and software versions. On certain Windows systems, you can use this information to establish unauthenticated connections and sometimes even map drives.