Testing Multi-Domain Subject Alternative Names Certificates

by Ramses Soto-Navarro ramses@sotosystems.com, 3/2/2023

Setup Apache
Certificate Script
Create Certificate
Second Virtual Host


Brief notes on how to create and verify multi-domain SSL certificates using the subject alternative names extension. Useful for Apache web URLs that require many different subdomains, while using one certificate. The same technique can be used for OpenSSL self-signed test certificates or official certificate signing requests, which service multiple domains with one certificate. Here we will use a Linux Red Hat 9 test scenario. The audience is experienced Linux administrators.

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