Overview root- and intermediate certificates
CA's (certificate authorities) use root- and intermediate certificates. Those should be installed together with the site (domain) certificate on the Web server, otherwise it may be that browsers or mobile phones will give an error message when trying to connect to the secured domain. No certificate yet? Place the request before downloading the intermediates.
On this page you'll find an overview of the current root and intermediate certificates and the corresponding bundle files. The bundle files contain the root and intermediate certificates combined, so they an be used directly with e.g. Apache. The method of installation depends on the type of server and software. For many products we have an installation guide in our knowledge base.
Sectigo (formerly Comodo)
Sectigo Code Signing