How do I park secure.primary.com on top of the multisite ID:1 domain: www.primary.com (primary multisite domain)
Install WordPress MU Domain MappingPlugin, and edit the wp_domain_mapping database table. Insert a new row for blog_id #1 manually, for example: +——+———–+———————-+———-+ | id | blog_id | domain | active | +——+———–+———————-+———-+ | 5 | 1 | secure.primary.com | 1 | +——+———–+———————-+———-+