The Windows Mobile device needs the Domain Name System (DNS) name for MDM Gateway Server to begin IPsec communication. You must enter a cmdlet through MDM Shell to achieve this. You must run the cmdlet on a computer that has the MDM Administrator Tools component, MDM Console, installed. You should specify a DNS name that maps to the IP Address for MDM Gateway Server. If you use DNS load balancing for multiple computers that are running MDM Gateway Server, you should map all IP addresses for all computers that are running MDM Gateway Server to the DNS name. Mobile devices enrolled with the incorrect MDM Gateway Server URI will try to contact that URI, but will be unmanageable until you correct the URI or re-enroll the device.
To set the enrollment configuration for the MDM Gateway Server URI
On a computer that has MDM Console, choose Start, choose All Programs, choose Microsoft System Center Mobile Device Manager, and then choose Mobile Device Manager Shell.
In MDM Shell, execute the following cmdlet:
Set-EnrollmentConfig -GatewayURI [External Gateway DNS]