Reactivating WP Multisite after deactivated

The Multisite (subdomain version) defining lines in my wp-config.php file were some how commented out. I uncommented them, but now I am unable to get to the other sites on the network (Site2). Site2, for instance, brings up a 404 error. Also, the SSL certificate for Site2 shows it is for another site. The main site works fine. How do I get my network sites back up?