Binding <binding>


The <binding> element of the <bindings> element allows you to configure the information required for requests to communicate with a Web site.

You can configure binding information when you create a Web site, or you can edit the binding information after you create the site. Binding information includes the protocol that clients use to communicate with the site, the site's IP address, the port number, and a host header.

The <binding> element contains two attributes to configure the binding information: bindingInformation and protocol. The bindingInformation attribute contains the IP address, the port number and, optionally, the host header for the site. The protocol attribute defines the protocol to use to communicate with the site.

You can configure the collection of bindings for a site using IIS Manager by selecting the site and using the Bindings... or Advanced Settings... links in the Actions pane or by clicking Edit Bindings... on the site's shortcut menu.


Version Notes
IIS 7.5 The <binding> element was not modified in IIS 7.5.
IIS 7.0 The <binding> element of the <bindings> collection was introduced in IIS 7.0.
IIS 6.0 The <bindings> collection replaces sections of the ServerBindings property on the IIS 6.0 IIsWebServer metabase object.


The <binding> element is included in the default installation of IIS 7.

How To

How to add binding information to a site

  1. Open Internet Information Services (IIS) Manager:
    • If you are using Windows Server 2008 or Windows Server 2008 R2:
      • On the taskbar, click Start, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
    • If you are using Windows Vista or Windows 7:
      • On the taskbar, click Start, and then click Control Panel.
      • Double-click Administrative Tools, and then double-click Internet Information Services (IIS) Manager.
  2. In the Connections pane, expand the server name, expand Sites, and then click the Web site on which you want to configure the bindings.
  3. In the Actions pane, click Bindings...
  4. In the Site Bindings dialog box, click Add...

  5. In the Add Site Binding dialog box, add the binding information, and then click OK.


You can add <binding> elements within the <bindings> element for each site in the ApplicationHost.config file. Each site must have at least one HTTP or HTTPS binding to be viewable over the Internet.


Attribute Description
bindingInformation Required string attribute.

Specifies information to communicate with a site. For example, a Web site binding includes the IP address (or unspecified IP addresses), the port number, and an optional host header used to communicate with the site.
protocol Required string attribute.

Specifies the protocol for communicating with a site.

Child Elements


Configuration Sample

The following example defines a site named Contoso with two bindings. The first binding is for a hostname of "" on port 80 for the IP address of, and the second binding is for an HTTPS binding for all IP addresses over port 443.

<site name="Contoso" id="2">
   <application path="/" applicationPool="Contoso">
      <virtualDirectory path="/" physicalPath="C:\inetpub\wwwroot" />
      <binding protocol="http" bindingInformation="" />
      <binding protocol="https" bindingInformation="*:443:" />

Sample Code

The following examples configure a site named Contoso with a hostname of "" on port 80 for the IP address of, and an HTTPS binding for all IP addresses over port 443.


appcmd.exe set site / /+bindings.[protocol='http',bindingInformation='']

appcmd.exe set site / /+bindings.[protocol='https',bindingInformation='*:443:']

Or you can use:

appcmd.exe set config -section:system.applicationHost/sites /+"[name='Contoso'].bindings.[protocol='http',bindingInformation='']" /commit:apphost

appcmd.exe set config -section:system.applicationHost/sites /+"[name='Contoso'].bindings.[protocol='https',bindingInformation='*:443:']" /commit:apphost

Note: You must be sure to set the commit parameter to apphost when you use AppCmd.exe to configure these settings. This commits the configuration settings to the appropriate location section in the ApplicationHost.config file.


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 sitesSection = config.GetSection("system.applicationHost/sites");
          ConfigurationElementCollection sitesCollection = sitesSection.GetCollection();
          ConfigurationElement siteElement = FindElement(sitesCollection, "site", "name", @"Contoso");

          if (siteElement == null) throw new InvalidOperationException("Element not found!");

          ConfigurationElementCollection bindingsCollection = siteElement.GetCollection("bindings");
          ConfigurationElement bindingElement = bindingsCollection.CreateElement("binding");
          bindingElement["protocol"] = @"http";
          bindingElement["bindingInformation"] = @"";

          ConfigurationElement bindingElement1 = bindingsCollection.CreateElement("binding");
          bindingElement1["protocol"] = @"https";
          bindingElement1["bindingInformation"] = @"*:443:";


   private static ConfigurationElement FindElement(ConfigurationElementCollection collection, string elementTagName, params string[] keyValues)
      foreach (ConfigurationElement element in collection)
         if (String.Equals(element.ElementTagName, elementTagName, StringComparison.OrdinalIgnoreCase))
            bool matches = true;
            for (int i = 0; i < keyValues.Length; i += 2)
               object o = element.GetAttributeValue(keyValues[i]);
               string value = null;
               if (o != null)
                  value = o.ToString();
               if (!String.Equals(value, keyValues[i + 1], StringComparison.OrdinalIgnoreCase))
                  matches = false;
            if (matches)
               return element;
      return null;


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 sitesSection As ConfigurationSection = config.GetSection("system.applicationHost/sites")
      Dim sitesCollection As ConfigurationElementCollection = sitesSection.GetCollection
      Dim siteElement As ConfigurationElement = FindElement(sitesCollection, "site", "name", "Contoso")

      If (siteElement Is Nothing) Then
         Throw New InvalidOperationException("Element not found!")
      End If

      Dim bindingsCollection As ConfigurationElementCollection = siteElement.GetCollection("bindings")

      Dim bindingElement As ConfigurationElement = bindingsCollection.CreateElement("binding")
      bindingElement("protocol") = "http"
      bindingElement("bindingInformation") = ""

      Dim bindingElement1 As ConfigurationElement = bindingsCollection.CreateElement("binding")
      bindingElement1("protocol") = "https"
      bindingElement1("bindingInformation") = "*:443:"

   End Sub

   Private Function FindElement(ByVal collection As ConfigurationElementCollection, ByVal elementTagName As String, ByVal ParamArray keyValues() As String) As ConfigurationElement
      For Each element As ConfigurationElement In collection
         If String.Equals(element.ElementTagName, elementTagName, StringComparison.OrdinalIgnoreCase) Then
            Dim matches As Boolean = True
            Dim i As Integer
            For i = 0 To keyValues.Length - 1 Step 2
               Dim o As Object = element.GetAttributeValue(keyValues(i))
               Dim value As String = Nothing
               If (Not (o) Is Nothing) Then
                  value = o.ToString
               End If
               If Not String.Equals(value, keyValues((i + 1)), StringComparison.OrdinalIgnoreCase) Then
                  matches = False
                  Exit For
               End If
            If matches Then
               Return element
            End If
         End If
      Return Nothing
   End Function

End Module


var adminManager = new ActiveXObject('Microsoft.ApplicationHost.WritableAdminManager');
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST";
var sitesSection = adminManager.GetAdminSection("system.applicationHost/sites", "MACHINE/WEBROOT/APPHOST");
var sitesCollection = sitesSection.Collection;
var siteElementPos = FindElement(sitesCollection, "site", ["name", "Contoso"]);

if (siteElementPos == -1) throw "Element not found!";

var siteElement = sitesCollection.Item(siteElementPos);
var bindingsCollection = siteElement.ChildElements.Item("bindings").Collection;

var bindingElement = bindingsCollection.CreateNewElement("binding");
bindingElement.Properties.Item("protocol").Value = "http";
bindingElement.Properties.Item("bindingInformation").Value = "";

var bindingElement1 = bindingsCollection.CreateNewElement("binding");
bindingElement1.Properties.Item("protocol").Value = "https";
bindingElement1.Properties.Item("bindingInformation").Value = "*:443:";


function FindElement(collection, elementTagName, valuesToMatch) {
   for (var i = 0; i < collection.Count; i++) {
      var element = collection.Item(i);
      if (element.Name == elementTagName) {
         var matches = true;
         for (var iVal = 0; iVal < valuesToMatch.length; iVal += 2) {
            var property = element.GetPropertyByName(valuesToMatch[iVal]);
            var value = property.Value;
            if (value != null) {
               value = value.toString();
            if (value != valuesToMatch[iVal + 1]) {
               matches = false;
         if (matches) {
            return i;
   return -1;


Set adminManager = createObject("Microsoft.ApplicationHost.WritableAdminManager")
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST"
Set sitesSection = adminManager.GetAdminSection("system.applicationHost/sites", "MACHINE/WEBROOT/APPHOST")
Set sitesCollection = sitesSection.Collection
siteElementPos = FindElement(sitesCollection, "site", Array("name", "Contoso"))

If siteElementPos = -1 Then
   WScript.Echo "Element not found!"
End If

Set siteElement = sitesCollection.Item(siteElementPos)
Set bindingsCollection = siteElement.ChildElements.Item("bindings").Collection

Set bindingElement = bindingsCollection.CreateNewElement("binding")
bindingElement.Properties.Item("protocol").Value = "http"
bindingElement.Properties.Item("bindingInformation").Value = ""

Set bindingElement1 = bindingsCollection.CreateNewElement("binding")
bindingElement1.Properties.Item("protocol").Value = "https"
bindingElement1.Properties.Item("bindingInformation").Value = "*:443:"


Function FindElement(collection, elementTagName, valuesToMatch)
   For i = 0 To CInt(collection.Count) - 1
      Set element = collection.Item(i)
      If element.Name = elementTagName Then
         matches = True
         For iVal = 0 To UBound(valuesToMatch) Step 2
            Set property = element.GetPropertyByName(valuesToMatch(iVal))
            value = property.Value
            If Not IsNull(value) Then
               value = CStr(value)
            End If
            If Not value = CStr(valuesToMatch(iVal + 1)) Then
               matches = False
               Exit For
            End If
         If matches Then
            Exit For
         End If
      End If
   If matches Then
      FindElement = i
      FindElement = -1
   End If
End Function
Deprecated Elements