After updating Confluence to version 7.4.17 to resolve the vulnerability CVE-2022-26134, we get the error message "Database connection failed." We've downloaded mysql-connector-java-5.1.48-bin.jar and placed it in /WEB-INF/lib/ and restarted Confluence, but the issue persists. We've made sure MySQL is running on the server and that we can log into the database with the credentials specified in confluence.cfg.xml.
What further troubleshooting steps can we take to determine why Confluence is experiencing this error after the upgrade?