This guide explains how to generate a certificate signing request (CSR) for a domain name and all its subdomains with a Web Hosting plan (excluding free Starter plans), allowing you to encrypt the connection to your domain name and all its subdomains via a single SSL certificate.

Introduction

• The configuration allows for a "named site" and a "backup site"; to ensure this works without conflict, make sure that the wildcard and your specific subdomains do not overlap on the same web hosting:
  • DNS level: the priority is natural: if a specific subdomain exists (e.g., prive.domain.xyz), it is used; otherwise, the request is redirected to the wildcard (*.domain.xyz).
  • Server level: it is necessary to be vigilant: if the wildcard and the specific subdomain are on the same server, the software implementation (Apache) decides; Apache processes requests according to the evaluation order of the configuration files.
  • The risk: if the wildcard is evaluated first, it "captures" all traffic, making your specific subdomain inaccessible, even if it exists elsewhere.
  • Therefore, you should not place the wildcard on the same hosting as a more specific subdomain that overlaps with it.

Setting up a Wildcard Certificate

1. Add a domain alias with an asterisk (*)

To add a wildcard alias (*) to your website:

1. Click here to access the hosting & website management section in your Infomaniak Manager (❓: help).
2. Click on the name of the website in question.
3. Then, click on the down arrow ‍ to expand the Domains section of that website.
4. Click on the Add a domain button:
   
5. Enter the domain name to add in the following format:
   • *.domain.xyz (the asterisk is required, followed by a period, and then the domain name of the website, which in this example is domain.xyz)
6. Click the Confirm button to complete the process:
   

2. Install an SSL certificate or update it

Example of how to update the existing certificate to include the * wildcard subdomain:

1. Click here to access the hosting & website management section in your Infomaniak Manager (❓: help).
2. Click on the name of the website in question.
3. Click on SSL Certificate in the left-hand menu.
4. Click on the action menu ⋮ located on the right.
5. Click on Update certificate:
   
6. Make sure the newly added subdomain is selected.
7. Click the Install button at the bottom:
   
8. Please wait while the process is created or updated.