To configure binding in IIS to respond to specific IP, port, and host header requests, site binding needs to be set manually. The steps to add binding based on IP and port are: Open IIS Manager → Select Site → Click "Binding" → Add → Select IP → Fill in the port → Leave a blank host name. To configure binding with host headers, you need to fill in different domain names under the same IP and port to support multiple sites. Notes include: HTTPS recommends allocating independent IP or enabling SNI, checking binding order, ensuring firewall release, verifying local access, etc. Common problems such as "all unassigned" bindings to other sites, DNS resolution errors, certificate mismatch, etc. may cause access failure and should be checked one by one.

When configuring binding in IIS, you need to manually set up site binding if you want your website to respond only to specific IP addresses, ports, and host header requests. This not only helps you better manage the situation where multiple sites share a server, but also improves security and access control capabilities.

How to add IP and port-based bindings

IIS may listen to all unassigned IP addresses by default (i.e. "All unassigned"), but if you have multiple network cards or public IPs, you may need to specify an IP to bind the site.

The operation steps are as follows:

• Open IIS Manager and select the target site
• Click "Binding" in the right operation panel
• Click "Add"
• In the pop-up window:
  • IP address: Pull down to select the specific IP you want to bind to
  • Port: Fill in the port number you want to listen to (such as 80 or 443)
  • Leave the host name blank

After this setting, the site will only be accessed through the specified IP and port, and other bindings will not affect it.

Configure binding with host header to support multiple domain names

When you want to host multiple websites on the same IP and port, you need to use the Host Header. For example, if you run example.com and test.com on the same server, you can use this method.

The specific approach is:

• When adding a binding, fill in the corresponding domain name in the "Host Name" column (for example, www.example.com)
• Make sure that DNS has resolved the domain name to the server's IP address
• Each site is bound to the same IP and port, but the host header is different

Note: If using HTTPS, it is best to assign IPs separately for each domain name, or use SNI (Server Name Indication) to implement SSL binding of shared IPs.

Frequently Asked Questions and Precautions

Sometimes, even if the correct IP and port are bound, the website is still inaccessible. Common reasons include:

• Other sites are bound to "all unassigned", resulting in the request being matched first
• The firewall does not have the corresponding port open
• The IP address is not correctly enabled in a multi-network card environment
• HTTPS is used but the certificate does not match the host header

Solutions include checking the binding order, ensuring the firewall release, testing whether local access is normal, etc.

Basically that's it. Configuration binding may seem simple, but in actual deployment, it is easy to cause problems due to negligence in details, especially when multiple sites and HTTPS are involved, remember to verify each link step by step.

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