New Exchange Migration Does Not Work Properly After Old Exchange Services Shut Off

Moved Exchange 2013 SP1 mailboxes, system mailboxes, public folders and OAB to new server with Exchange 2013 SP1. Followed all the suggestions here:

https://social.technet.microsoft.com/Forums/en-US/1bdf67a1-ad0e-4e96-922f-3778d6bd8e98/move-exchange-2013-to-new-virtual-server-including-settings?forum=exchangesvrdeploy

Problem is when we shut off the old exchange server services, no mail flows and can not reach OWA. It seems as though the servers are "coexisting". I say coexisting because all the firewall rules point to the new server, all the settings in ECA/ECP point to the new server, all the DNS records point to the new server. We need to be able to run exchange on the new server without the old server running. Is there something I left off?