A host header is a value that is used to associate a specific host name with a website hosted on a web server. This allows multiple websites to be hosted on a single IP address. However, if your server is running Windows Server 2008, it may not support Server Name Indication (SNI), which is a feature that allows multiple SSL/TLS certificates to be bound to a single IP address.
If this is the case, you can still configure a host header for a website in IIS 7 on Windows Server 2008 by following these steps:
- Open Internet Information Services (IIS) Manager on the Windows Server 2008 machine.
- In the left pane, expand the server and click on the Sites folder.
- Right-click on the website for which you want to configure a host header and select Properties.
- In the Properties window, click on the Web Site tab.
- Under Web Site Identification, click on the Advanced button.
- In the Advanced Web Site Identification window, click on the Add button.
- In the Add Host Header dialog box, enter the host name in the Host header field.
- Click on the OK button to close the dialog box.
- Click on the OK button to close the Advanced Web Site Identification window.
- Click on the Apply button to save the changes.
- Click on the OK button to close the Properties window.
It is important to note that you will also need to set up a DNS entry for the host header name to point to the IP address of the Windows Server 2008 machine. This way, when a client makes a request for the host header name, the DNS server will resolve it to the IP address of the Windows Server 2008 machine, and IIS will be able to direct the request to the appropriate website based on the host header value.
Additionally, you should also check that the host header is unique and not already in use by another website, and you should also check that the host header value is valid, in order to avoid possible errors.
It is also important to note that the host header configuration does not affect the IP address of the website, it only affects the host name of the website.
When configuring the host header, be sure to use a fully qualified domain name (FQDN) and not an IP address. This is to ensure that the host header configuration works correctly and that clients can access the website using the host header name.
It is also recommended to test the host header configuration after you have set it up, to ensure that the website is accessible using the host header name.
In conclusion, configuring a host header for a website in IIS 7 on Windows Server 2008 where SNI is not supported can be done by following the steps above and ensure that the host header is properly set up and configured.