If you have a Web or Cloud hosting plan at Hostinger, you have free and automatic SSL installations for all of your websites. If the installation of Lifetime SSL failed, check this article: How to Fix a Failed Lifetime SSL Installation.
In case you are using a different type of SSL certificate, check the following possible causes of a failed installation and how to fix them:
The Domain is Not Pointing
For a successful SSL installation, your domain should be correctly pointed and fully propagated. To do this, go to your domain's DNS zone and ensure you are using Hostinger values:
Web and Cloud hosting plans - use the following nameservers
cPanel hosting plans - use the following nameservers
For VPS hosting - check this guide: How to Point a Domain to Your VPS
Once you've made any changes to your domain's DNS zone, please allow up to 24 hours for the changes to propagate fully. You can retry the SSL installation afterward.
An SSL installation can fail if the private key doesn't match the Certificate Signing Request (CSR) or the certificate itself. This issue often arises when the private key is lost or replaced. Additionally, installation failures can occur if the certificate is revoked or has expired.
To avoid this, check that your certificate's public and private keys, as well as the CSR, are valid and accurate. If you need to create a CSR, you can use the following tool: CSR Generator.
Some SSL certificates may have special requirements to work properly; for example, wildcard or multi-domain certificates are supported only on VPS hosting.
By following these guidelines, you can overcome common SSL installation issues and ensure a secure browsing experience for your website visitors. If you encounter any further difficulties, don't hesitate to seek assistance from your SSL certificate provider's support team.