If Carillon management portal IIS web site is using host header DNS name and you want to access Carillon management portal locally, you need to disable OS loopback Check. Access using the host header name will work when connectiong remotely from another device without disabling loobback check.
Description of the loopback check and instructions how to disable can be found from here: Error message when you try to access a server locally by using its FQDN or its CNAME alias after you install Windows Server 2003 Service Pack 1 - Windows Server | Microsoft Docs
