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Finally I found the solution for my request. Credit goes to <a href="http://www.csharpfriends.com/Forums/ShowPost.aspx?PostID=20989" rel="noreferrer">CSharpFriends.com</a>, now migrated to <a href="http://www.debugging.com/bug/4715" rel="noreferrer">debugging.com</a>. The following windows API should be used: <pre><code>//API to get list of connections [DllImport("iphlpapi.dll")] private static extern int GetTcpTable(IntPtr pTcpTable, ref int pdwSize, bool bOrder); //API to change status of connection [DllImport("iphlpapi.dll")] private static extern int SetTcpEntry(IntPtr pTcprow); //Convert 16-bit value from network to host byte order [DllImport("wsock32.dll")] private static extern int ntohs(int netshort); //Convert 16-bit value back again [DllImport("wsock32.dll")] private static extern int htons(int netshort); </code></pre>   <pre><code>using System; using System.Collections.Generic; using System.Text; using System.Collections; using System.Runtime.InteropServices; namespace ConnectionManager { class Disconnector { } public class Starter { public static void Main(string[] args) { if (args.Length == 0) { Console.WriteLine("Disconnect IP1 [IP2 [IP3 [IPn]]]"); Console.WriteLine(""); Console.WriteLine("Connections up now:"); string[] cons = Disconnecter.Connections(Disconnecter.State.Established); foreach (string s in cons) { Console.WriteLine(s); } } else { foreach (string s in args) { Disconnecter.CloseLocalIP(s); Disconnecter.CloseRemoteIP(s); } } } } public class Disconnecter { /// <summary> /// Enumeration of the states /// </summary> public enum State { /// <summary> All </summary> All = 0, /// <summary> Closed </summary> Closed = 1, /// <summary> Listen </summary> Listen = 2, /// <summary> Syn_Sent </summary> Syn_Sent = 3, /// <summary> Syn_Rcvd </summary> Syn_Rcvd = 4, /// <summary> Established </summary> Established = 5, /// <summary> Fin_Wait1 </summary> Fin_Wait1 = 6, /// <summary> Fin_Wait2 </summary> Fin_Wait2 = 7, /// <summary> Close_Wait </summary> Close_Wait = 8, /// <summary> Closing </summary> Closing = 9, /// <summary> Last_Ack </summary> Last_Ack = 10, /// <summary> Time_Wait </summary> Time_Wait = 11, /// <summary> Delete_TCB </summary> Delete_TCB = 12 } /// <summary> /// Connection info /// </summary> private struct MIB_TCPROW { public int dwState; public int dwLocalAddr; public int dwLocalPort; public int dwRemoteAddr; public int dwRemotePort; } //API to get list of connections [DllImport("iphlpapi.dll")] private static extern int GetTcpTable(IntPtr pTcpTable, ref int pdwSize, bool bOrder); //API to change status of connection [DllImport("iphlpapi.dll")] //private static extern int SetTcpEntry(MIB_TCPROW tcprow); private static extern int SetTcpEntry(IntPtr pTcprow); //Convert 16-bit value from network to host byte order [DllImport("wsock32.dll")] private static extern int ntohs(int netshort); //Convert 16-bit value back again [DllImport("wsock32.dll")] private static extern int htons(int netshort); /// <summary> /// Testexample /// </summary> public static void TEST() { Console.WriteLine("Not Working Yet!!!"); //string[] ret = Connections(State.All); //foreach (string con in ret) if (con.IndexOf("192.168.0.101") > -1) System.Diagnostics.Debug.WriteLine(con); //System.Diagnostics.Debug.WriteLine("----------------------------"); //CloseRemotePort(1863); //CloseRemotePort(80); //ret = Connections(State.All); //foreach (string con in ret) if (con.IndexOf("192.168.0.101") > -1) System.Diagnostics.Debug.WriteLine(con); } /// <summary> /// Close all connection to the remote IP /// </summary> /// <param name="IP">IPen på remote PC</param> public static void CloseRemoteIP(string IP) { MIB_TCPROW[] rows = getTcpTable(); for (int i = 0; i < rows.Length; i++) { if (rows[i].dwRemoteAddr == IPStringToInt(IP)) { rows[i].dwState = (int)State.Delete_TCB; IntPtr ptr = GetPtrToNewObject(rows[i]); int ret = SetTcpEntry(ptr); } } } /// <summary> /// Close all connections at current local IP /// </summary> /// <param name="IP"></param> public static void CloseLocalIP(string IP) { MIB_TCPROW[] rows = getTcpTable(); for (int i = 0; i < rows.Length; i++) { if (rows[i].dwLocalAddr == IPStringToInt(IP)) { rows[i].dwState = (int)State.Delete_TCB; IntPtr ptr = GetPtrToNewObject(rows[i]); int ret = SetTcpEntry(ptr); } } } /// <summary> /// Closes all connections to the remote port /// </summary> /// <param name="port"></param> public static void CloseRemotePort(int port) { MIB_TCPROW[] rows = getTcpTable(); for (int i = 0; i < rows.Length; i++) { if (port == ntohs(rows[i].dwRemotePort)) { rows[i].dwState = (int)State.Delete_TCB; IntPtr ptr = GetPtrToNewObject(rows[i]); int ret = SetTcpEntry(ptr); } } } /// <summary> /// Closes all connections to the local port /// </summary> /// <param name="port"></param> public static void CloseLocalPort(int port) { MIB_TCPROW[] rows = getTcpTable(); for (int i = 0; i < rows.Length; i++) { if (port == ntohs(rows[i].dwLocalPort)) { rows[i].dwState = (int)State.Delete_TCB; IntPtr ptr = GetPtrToNewObject(rows[i]); int ret = SetTcpEntry(ptr); } } } /// <summary> /// Close a connection by returning the connectionstring /// </summary> /// <param name="connectionstring"></param> public static void CloseConnection(string connectionstring) { try { //Split the string to its subparts string[] parts = connectionstring.Split('-'); if (parts.Length != 4) throw new Exception("Invalid connectionstring - use the one provided by Connections."); string[] loc = parts[0].Split(':'); string[] rem = parts[1].Split(':'); string[] locaddr = loc[0].Split('.'); string[] remaddr = rem[0].Split('.'); //Fill structure with data MIB_TCPROW row = new MIB_TCPROW(); row.dwState = 12; byte[] bLocAddr = new byte[] { byte.Parse(locaddr[0]), byte.Parse(locaddr[1]), byte.Parse(locaddr[2]), byte.Parse(locaddr[3]) }; byte[] bRemAddr = new byte[] { byte.Parse(remaddr[0]), byte.Parse(remaddr[1]), byte.Parse(remaddr[2]), byte.Parse(remaddr[3]) }; row.dwLocalAddr = BitConverter.ToInt32(bLocAddr, 0); row.dwRemoteAddr = BitConverter.ToInt32(bRemAddr, 0); row.dwLocalPort = htons(int.Parse(loc[1])); row.dwRemotePort = htons(int.Parse(rem[1])); //Make copy of the structure into memory and use the pointer to call SetTcpEntry IntPtr ptr = GetPtrToNewObject(row); int ret = SetTcpEntry(ptr); if (ret == -1) throw new Exception("Unsuccessful"); if (ret == 65) throw new Exception("User has no sufficient privilege to execute this API successfully"); if (ret == 87) throw new Exception("Specified port is not in state to be closed down"); if (ret != 0) throw new Exception("Unknown error (" + ret + ")"); } catch (Exception ex) { throw new Exception("CloseConnection failed (" + connectionstring + ")! [" + ex.GetType().ToString() + "," + ex.Message + "]"); } } /// <summary> /// Gets all connections /// </summary> /// <returns></returns> public static string[] Connections() { return Connections(State.All); } /// <summary> /// Gets a connection list of connections with a defined state /// </summary> /// <param name="state"></param> /// <returns></returns> public static string[] Connections(State state) { MIB_TCPROW[] rows = getTcpTable(); ArrayList arr = new ArrayList(); foreach (MIB_TCPROW row in rows) { if (state == State.All || state == (State)row.dwState) { string localaddress = IPIntToString(row.dwLocalAddr) + ":" + ntohs(row.dwLocalPort); string remoteaddress = IPIntToString(row.dwRemoteAddr) + ":" + ntohs(row.dwRemotePort); arr.Add(localaddress + "-" + remoteaddress + "-" + ((State)row.dwState).ToString() + "-" + row.dwState); } } return (string[])arr.ToArray(typeof(System.String)); } //The function that fills the MIB_TCPROW array with connectioninfos private static MIB_TCPROW[] getTcpTable() { IntPtr buffer = IntPtr.Zero; bool allocated = false; try { int iBytes = 0; GetTcpTable(IntPtr.Zero, ref iBytes, false); //Getting size of return data buffer = Marshal.AllocCoTaskMem(iBytes); //allocating the datasize allocated = true; GetTcpTable(buffer, ref iBytes, false); //Run it again to fill the memory with the data int structCount = Marshal.ReadInt32(buffer); // Get the number of structures IntPtr buffSubPointer = buffer; //Making a pointer that will point into the buffer buffSubPointer = (IntPtr)((int)buffer + 4); //Move to the first data (ignoring dwNumEntries from the original MIB_TCPTABLE struct) MIB_TCPROW[] tcpRows = new MIB_TCPROW[structCount]; //Declaring the array //Get the struct size MIB_TCPROW tmp = new MIB_TCPROW(); int sizeOfTCPROW = Marshal.SizeOf(tmp); //Fill the array 1 by 1 for (int i = 0; i < structCount; i++) { tcpRows[i] = (MIB_TCPROW)Marshal.PtrToStructure(buffSubPointer, typeof(MIB_TCPROW)); //copy struct data buffSubPointer = (IntPtr)((int)buffSubPointer + sizeOfTCPROW); //move to next structdata } return tcpRows; } catch (Exception ex) { throw new Exception("getTcpTable failed! [" + ex.GetType().ToString() + "," + ex.Message + "]"); } finally { if (allocated) Marshal.FreeCoTaskMem(buffer); //Free the allocated memory } } private static IntPtr GetPtrToNewObject(object obj) { IntPtr ptr = Marshal.AllocCoTaskMem(Marshal.SizeOf(obj)); Marshal.StructureToPtr(obj, ptr, false); return ptr; } //Convert an IP string to the INT value private static int IPStringToInt(string IP) { if (IP.IndexOf(".") < 0) throw new Exception("Invalid IP address"); string[] addr = IP.Split('.'); if (addr.Length != 4) throw new Exception("Invalid IP address"); byte[] bytes = new byte[] { byte.Parse(addr[0]), byte.Parse(addr[1]), byte.Parse(addr[2]), byte.Parse(addr[3]) }; return BitConverter.ToInt32(bytes, 0); } //Convert an IP integer to IP string private static string IPIntToString(int IP) { byte[] addr = System.BitConverter.GetBytes(IP); return addr[0] + "." + addr[1] + "." + addr[2] + "." + addr[3]; } } } </code></pre>
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