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, do 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 your website management area in the Infomaniak Manager (need help?).
2. Click directly on the name assigned to the site in question:
   
3. Then, click on the down arrow ‍ to expand the Domains section of this site.
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 management interface for your website on the Infomaniak Manager (need help?).
2. Click directly on the name assigned to the site 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.