I am using JIRA. I checked the "Enable SSO Redirect" in the plugin configuration. I tried to access my JIRA main URL https://<jira-URL>, /login.jsp, /default.jsp, /secure/Dashboard.jspa and /secure/MyJiraHome.jspa but im always end up on the normal login page.
The "Enable SSO Redirect" is working with the "Force SSO URLs" field. That means that the plugin is only redirecting requests to URLs matching the regular expressions from the Force SSO URLs. To ensure that your main and all normal login URLs will be redirected, please check if the "Force SSO URLs" has included the default values:
You also can delete the whole "Force SSO URLs" field and save the plugin configuration to restore the default values.