HOW TO: Use Host Header Names to Host Multiple Sites from One IP
Address in IIS 5.0
SUMMARY
This step-by-step article shows
you how to use Host Headers to allow multiple host names to share a single IP
address.
IIS allows you to assign any number of sites to a single IP address and distinguish them by using host headers. When IIS receives a request for a Web page, it looks at the information sent in by the browser. If the browser is HTTP 1.1 compliant (Internet Explorer 3.x and later, or Netscape Navigator 3.x and later), the HTTP header contains the actual domain name requested. IIS uses this to determine which site should answer the request.
If the browser is not HTTP 1.1 compliant, you can program a core page to display all sites available and allow the user to choose which site to use. For instructions on how to do this, see the references section at the bottom of this article.
IIS allows you to assign any number of sites to a single IP address and distinguish them by using host headers. When IIS receives a request for a Web page, it looks at the information sent in by the browser. If the browser is HTTP 1.1 compliant (Internet Explorer 3.x and later, or Netscape Navigator 3.x and later), the HTTP header contains the actual domain name requested. IIS uses this to determine which site should answer the request.
If the browser is not HTTP 1.1 compliant, you can program a core page to display all sites available and allow the user to choose which site to use. For instructions on how to do this, see the references section at the bottom of this article.
Configure Host Header Names in
IIS 5.0
To configure host header names in IIS
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1.
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Start the Internet Service Manager (Iis.msc).
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2.
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Right-click the Web site to be configured, and then click Properties.
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3.
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On the Web Site tab, select the IP address that the site
will use.
Note: if you only have one IP address on the server, select All Unassigned, and set the |
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4.
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Click Advanced.
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5.
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In the Multiple identities for this Web Site list, select
the identity that you want to use.
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6.
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Click Edit, and then add the desired host header name.
NOTE: If you want this site to respond to more than one host header name, use the Add button to add additional identities to this list. Specify a different host header name for each identity, but be sure to use the same IP address and port. |
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7.
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Apply these changes and start the Web site (if it is not already
running).
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8.
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Register the host header name with the appropriate name
resolution system.
If the computer is on an intranet (a private LAN that uses Internet technology), register it with the intranet's name resolution system, such as the Windows Internet Name Service (WINS). If the computer is on the Internet, register the host header name with the Domain Name System (DNS), which is administered by InterNic. |
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9.
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After the host header name is registered with the name
resolution system, test it from a browser by attempting to browse the host
header name. The browser should open the expected Web site.
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Troubleshooting
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When your computer boots or when you manually start the
Microsoft Internet Information Server service, Event Viewer may log the following
event:
Event ID : 115
Source : w3svc Description : The service could not bind instance X.
This problem can occur when some or all of the Web sites that
are using Host Headers have the same port number defined for Secure Sockets
Layer (SSL). Internet Information Server 4.0 does not support the use of Host
Headers for SSL. For more information, see the references links below.
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Erratic behavior can occur when applying a host header name to
the default Web site if add-on packages for IIS (such as Microsoft Proxy
Server) are also being used. For this reason, it is generally not recommended
that you apply a host header name to the default Web site created by IIS.
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