Block IP address from any accessing website (asp.net)

One way direct web.config file put following code

<configuration>

<system.web>

<system.webServer>

    <security>

      <ipSecurity allowUnlisted="true">

       

        <clear/>

       

       

        <add ipAddress="192.168.1.8"/>

       

        <add ipAddress="192.168.1.8" subnetMask="255.255.255.0"/>

       

      ipSecurity>

    security>

    <modules runAllManagedModulesForAllRequests="true"/>

  system.webServer>

system.web>

configuration>

Other way

xml version="1.0"?>

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">

       <appSettings/>

       <connectionStrings/>

       <system.web>

              <httpModules>

                     <add name="SecurityHttpModule" type="SecurityHttpModule"/>

              httpModules>

              <compilation debug="true" targetFramework="4.0"/>

              <authentication mode="Windows"/>

              <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"/>system.web>

configuration>

And add on App_Code folder one HTTP module class file like “SecurityHttpModule.cs”

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Web;

using System.Net;

///

/// HTTP module to restrict access by IP address

///

public class SecurityHttpModule : IHttpModule

{

       public SecurityHttpModule() { }

    public void Init(HttpApplication context)

    {

        context.BeginRequest += new EventHandler(Application_BeginRequest);

    }

    private void Application_BeginRequest(object source, EventArgs e)

    {

        //HttpContext context = ((HttpApplication)source).Context;

        string ipAddress = GetIPAddress();

        if (IsValidIpAddress(ipAddress))

        {

            //context.Response.StatusCode = 403;  // (Forbidden)

            Response.Redirect("Default2.aspx");

        }

    }

    private bool IsValidIpAddress(string ipAddress)

    {

        return (ipAddress == "192.168.1.3");

    }

    public void Dispose() { /* clean up */ }

    public static string GetIPAddress()

    {

        string hostName = Dns.GetHostName();

        IPAddress address = Dns.Resolve(Dns.GetHostName()).AddressList[0];

        return address.ToString();

    }

   

}