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To secure an IIS site on Windows 11 using ZeroSSL, generate a Certificate Signing Request (CSR) in IIS Manager, submit it to ZeroSSL to download your .crt files, and use OpenSSL to combine them into an installable .pfx file. Finally, import the .pfx and bind it to your website.

Here is a quick, step-by-step process:

Step 1: Generate a CSR in IIS

1. Press Win + R, type inetmgr, and hit Enter to open IIS Manager.
2. Click your local server name in the Connections panel on the left.
3. Double-click Server Certificates under the IIS section.
4. In the Actions pane on the right, click Create Certificate Request…
5. Fill out your Distinguished Name properties (Common Name should match your domain, e.g., yourdomain.com) and click Next.
6. Set the Bit length to 2048 and click Next, then save the file to a location (e.g., C:\certs\csr.txt) and click Finish.

Step 2: Obtain and Convert the Certificate

1. Copy the text from csr.txt and paste it into the CSR box on the ZeroSSL Dashboard.
2. Complete domain verification (e.g., adding a CNAME or TXT record via your domain registrar).
3. Once verified, download the certificate files (select the DER/CRT format). You will get certificate.crt and ca_bundle.crt.
4. IIS requires certificates in .pfx format with the private key. Open a Command Prompt or PowerShell and combine the ZeroSSL files using OpenSSL:cmdopenssl pkcs12 -in certificate.crt -inkey private.key -certfile ca_bundle.crt -export -out iis_certificate.pfx Use code with caution.Note: Set a secure password for the PFX file when prompted.

Step 3: Import into IIS

1. Back in IIS Manager, double-click Server Certificates.
2. In the Actions pane, click Import…
3. Browse to your iis_certificate.pfx file, enter the password you created, and leave the certificate store as Personal.
4. Give it a friendly name (e.g., yourdomain.com-2025) and click OK.

Step 4: Bind the Certificate in IIS

1. In the Connections tree on the left, expand Sites and select your website.
2. In the right-hand Actions pane, click Bindings…
3. Click Add…
4. Select HTTPS from the Type dropdown.
5. Select your imported certificate from the SSL certificate dropdown.
6. Enter your domain name in the Host name field (if not a wildcard) and check Require Server Name Indication (SNI).
7. Click OK, then Close.