根据并发请求拒绝 <denyByConcurrentRequests>

概述

<denyByConcurrentRequests> 元素指定如果来自该客户端的并发 HTTP 连接请求数超过特定数目,则会阻止远程客户端。

兼容性

版本 说明
IIS 10.0 <denyByConcurrentRequests> 元素在 IIS 10.0 中未进行修改。
IIS 8.5 <denyByConcurrentRequests> 元素在 IIS 8.5 中未进行修改。
IIS 8.0 <denyByConcurrentRequests> 元素是在 IIS 8.0 中引入的。
IIS 7.5 空值
IIS 7.0 空值
IIS 6.0 空值

安装

若要根据并发请求数支持阻止 Web 服务器上的客户端,必须安装 IP 和域限制角色服务。

Windows Server 2012 或 Windows Server 2012 R2

  1. 在任务栏上,单击 “服务器管理器”。
  2. 在“服务器管理器”中,单击“管理”菜单,然后单击“添加角色和功能”。
  3. 在“添加角色和功能”向导中,单击“下一步”。 选择安装类型,然后单击“下一步”。 选择目标服务器,然后单击“下一步”。
  4. 在“服务器角色”页上,依次展开“Web 服务器 (IIS)”、“Web 服务器”和“安全性”,然后选择“IP 和域限制”。 单击 “下一步”
    Screenshot showing I P and Domain Restrictions selected.
  5. 在“选择功能”页上,单击“下一步”
  6. “确认安装选择”页上,单击“安装”
  7. 在“结果” 页面中单击“关闭”

Windows 8 或 Windows 8.1

  1. 在“开始”屏幕上,将指针一直移动到左下角,右键单击“开始”按钮,然后单击“控制面板”
  2. 在“控制面板”中,单击“程序与功能”,然后单击“打开或关闭 Windows 功能”。
  3. 依次展开“Internet 信息服务”、“万维网服务”和“安全性”,然后选择“IP 安全”。
    Screenshot showing Windows Features window with I P Security selected.
  4. 单击“确定”。
  5. 单击“关闭” 。

操作方式

如何根据并发请求数拒绝 IP 地址

  1. 打开 Internet Information Services (IIS) 管理器:

    • 如果使用 Windows Server 2012 或更高版本:

      • 在任务栏上,单击“服务器管理器”,单击“工具”,然后单击“Internet Information Services (IIS)管理器”
    • 如果使用的是 Windows 8 或更高版本:

      • 按住 Windows 键,按字母 X,然后单击“控制面板”。
      • 单击“管理工具”,然后双击“Internet 信息服务(IIS)管理器”。
  2. 在“连接”窗格中,选择要为服务器添加动态 IP 限制的服务器名称,或展开“站点”,然后选择一个站点为站点添加动态 IP 限制。

  3. 在“主页”窗格中,双击“IP 地址和域限制”功能。

  4. 在“操作”窗格中,单击“编辑动态限制设置...”

  5. 在“动态 IP 限制设置”对话框中,选择“根据并发请求数拒绝 IP 地址”,输入最大并发请求数,然后单击“确定”

    Screenshot showing the Dynamic I P Restrictions Settings dialog box with Deny I P Address based on the number of concurrent requests selected.

配置

<denyByConcurrentRequests> 元素在服务器或站点级别配置。

特性

属性 说明
enabled 可选布尔属性。

启用根据来自该客户端的并发 HTTP 连接请求数阻止远程客户端。

默认值为 false
maxConcurrentRequests 可选 uint 属性。

导致客户端被阻止的来自客户端的并发 HTTP 连接请求数。

默认值为 5

子元素

无。

配置示例

以下配置示例演示如何设置动态 IP 地址限制。

<system.webServer>
   <security>
      <dynamicIpSecurity enableLoggingOnlyMode="true">
         <denyByConcurrentRequests enabled="true" maxConcurrentRequests="10" />
         <denyByRequestRate enabled="true" maxRequests="30" 
            requestIntervalInMilliseconds="300" />
      </dynamicIpSecurity>
   </security>
</system.webServer>

代码示例

以下示例为站点配置 <dynamicIpSecurity>

AppCmd.exe

appcmd.exe set config "Default Web Site" -section:system.webServer/security/dynamicIpSecurity /denyAction:"Unauthorized" /enableProxyMode:"True" /enableLoggingOnlyMode:"True"  /commit:apphost
appcmd.exe set config "Default Web Site" -section:system.webServer/security/dynamicIpSecurity /denyByConcurrentRequests.enabled:"True" /denyByConcurrentRequests.maxConcurrentRequests:"10" /commit:apphost
appcmd.exe set config "Default Web Site" -section:system.webServer/security/dynamicIpSecurity /denyByRequestRate.enabled:"True" /denyByRequestRate.maxRequests:"25" /denyByRequestRate.requestIntervalInMilliseconds:"210"  /commit:apphost

注意

使用 AppCmd.exe 配置这些设置时,必须确保将 commit 参数设置为 apphost。 这会将配置设置提交到 ApplicationHost.config 文件中的相应位置部分。

C#

using System;
using System.Text;
using Microsoft.Web.Administration;

internal static class Sample {

    private static void Main() {
        
        using(ServerManager serverManager = new ServerManager()) { 
            Configuration config = serverManager.GetApplicationHostConfiguration();
            
            ConfigurationSection dynamicIpSecuritySection = config.GetSection("system.webServer/security/dynamicIpSecurity", "Default Web Site");
            dynamicIpSecuritySection["denyAction"] = @"Forbidden";
            dynamicIpSecuritySection["enableProxyMode"] = true;
            dynamicIpSecuritySection["enableLoggingOnlyMode"] = true;
            
            ConfigurationElement denyByConcurrentRequestsElement = dynamicIpSecuritySection.GetChildElement("denyByConcurrentRequests");
            denyByConcurrentRequestsElement["enabled"] = true;
            denyByConcurrentRequestsElement["maxConcurrentRequests"] = 10;
            
            ConfigurationElement denyByRequestRateElement = dynamicIpSecuritySection.GetChildElement("denyByRequestRate");
            denyByRequestRateElement["enabled"] = true;
            denyByRequestRateElement["maxRequests"] = 10;
            denyByRequestRateElement["requestIntervalInMilliseconds"] = 10;
            
            serverManager.CommitChanges();
        }
    }
}

VB.NET

Imports System
Imports System.Text
Imports Microsoft.Web.Administration
Module Sample

   Sub Main()
      Dim serverManager As ServerManager = New ServerManager
      Dim config As Configuration = serverManager.GetApplicationHostConfiguration
      Dim dynamicIpSecuritySection As ConfigurationSection = config.GetSection("system.webServer/security/dynamicIpSecurity", "Default Web Site")
      dynamicIpSecuritySection("denyAction") = "Forbidden"
      dynamicIpSecuritySection("enableProxyMode") = true
      dynamicIpSecuritySection("enableLoggingOnlyMode") = true
      Dim denyByConcurrentRequestsElement As ConfigurationElement = dynamicIpSecuritySection.GetChildElement("denyByConcurrentRequests")
      denyByConcurrentRequestsElement("enabled") = true
      denyByConcurrentRequestsElement("maxConcurrentRequests") = 10
      Dim denyByRequestRateElement As ConfigurationElement = dynamicIpSecuritySection.GetChildElement("denyByRequestRate")
      denyByRequestRateElement("enabled") = true
      denyByRequestRateElement("maxRequests") = 10
      denyByRequestRateElement("requestIntervalInMilliseconds") = 10
      serverManager.CommitChanges
   End Sub
End Module

JavaScript

var adminManager = new ActiveXObject('Microsoft.ApplicationHost.WritableAdminManager');
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST";

var dynamicIpSecuritySection = adminManager.GetAdminSection ("system.webServer/security/dynamicIpSecurity", "MACHINE/WEBROOT/APPHOST/Default Web Site");
dynamicIpSecuritySection.Properties.Item("denyAction").Value = "Unauthorized";
dynamicIpSecuritySection.Properties.Item("enableProxyMode").Value = true;
dynamicIpSecuritySection.Properties.Item("enableLoggingOnlyMode").Value = true;
var denyByConcurrentRequestsElement = dynamicIpSecuritySection.ChildElements.Item("denyByConcurrentRequests");
denyByConcurrentRequestsElement.Properties.Item("enabled").Value = true;
denyByConcurrentRequestsElement.Properties.Item("maxConcurrentRequests").Value = 10;
var denyByRequestRateElement = dynamicIpSecuritySection.ChildElements.Item("denyByRequestRate");
denyByRequestRateElement.Properties.Item("enabled").Value = true;
denyByRequestRateElement.Properties.Item("maxRequests").Value = 25;
denyByRequestRateElement.Properties.Item("requestIntervalInMilliseconds").Value = 210;

adminManager.CommitChanges();

VBScript

Set adminManager = CreateObject("Microsoft.ApplicationHost.WritableAdminManager")
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST"

Set dynamicIpSecuritySection = adminManager.GetAdminSection ("system.webServer/security/dynamicIpSecurity", "MACHINE/WEBROOT/APPHOST/Default Web Site")
dynamicIpSecuritySection.Properties.Item("denyAction").Value = "Unauthorized"
dynamicIpSecuritySection.Properties.Item("enableProxyMode").Value = true
dynamicIpSecuritySection.Properties.Item("enableLoggingOnlyMode").Value = true
Set denyByConcurrentRequestsElement = dynamicIpSecuritySection.ChildElements.Item ("denyByConcurrentRequests")
denyByConcurrentRequestsElement.Properties.Item("enabled").Value = true
denyByConcurrentRequestsElement.Properties.Item("maxConcurrentRequests").Value = 10
Set denyByRequestRateElement = dynamicIpSecuritySection.ChildElements.Item("denyByRequestRate")
denyByRequestRateElement.Properties.Item("enabled").Value = true
denyByRequestRateElement.Properties.Item("maxRequests").Value = 25
denyByRequestRateElement.Properties.Item("requestIntervalInMilliseconds").Value = 210

adminManager.CommitChanges()

PowerShell

Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST' -location 'Default Web Site' -filter "system.webServer/security/dynamicIpSecurity" -name "denyAction" -value "Unauthorized"
Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST' -location 'Default Web Site' -filter "system.webServer/security/dynamicIpSecurity" -name "enableProxyMode" -value "True"
Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST' -location 'Default Web Site' -filter "system.webServer/security/dynamicIpSecurity" -name "enableLoggingOnlyMode" -value "True"
Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST' -location 'Default Web Site' -filter "system.webServer/security/dynamicIpSecurity/denyByConcurrentRequests" -name "enabled" -value "True"
Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST' -location 'Default Web Site' -filter "system.webServer/security/dynamicIpSecurity/denyByConcurrentRequests" -name "maxConcurrentRequests" -value 20
Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST' -location 'Default Web Site' -filter "system.webServer/security/dynamicIpSecurity/denyByRequestRate" -name "enabled" -value "True"
Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST' -location 'Default Web Site' -filter "system.webServer/security/dynamicIpSecurity/denyByRequestRate" -name "maxRequests" -value 20
Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST' -location 'Default Web Site' -filter "system.webServer/security/dynamicIpSecurity/denyByRequestRate" -name "requestIntervalInMilliseconds" -value 20