Using SDxServerManager.exe with the /enableiwa argument allows you to enable Integrated Windows Authentication (IWA) as the authentication method for securing internal server processes. You must provide additional information using several arguments as listed below.
/sn: - names the site for which IWA is to be enabled (required).
/u: - identifies the user name used to enable IWA (required).
/p: - identifies the user password (required).
/d: - identifies the users domain and sets the application pool identity to a domain user (optional)
The following example enables IWA and sets the application pool identity to a domain user
SDxServermanager.exe /enableiwa /sn:NewSite /u:IWAUser /p:IWAUserPwd /d:SPFDomain