hi i have on my lab network the following VMs: AD (192.168.14.10 internal network), Exchange server 2010 Hub Transport, Mailbox and Client access server (192.168.14.11 internal network) and Edge transport server (ip assigned by DHCP and connected to the internet). i have opened all the required ports and ran on the Edge server : New-Edge Subscription -Filename "c:\EdgeSubscription.xml" and imported the file to the HTS but whenever i run the Test-EdgeSynchronization i get the above error, any help would be appreciated. katlego

Thanks a lot Ashwini :-), it worked. i opened all the ports (LDAP, sLDAP and SMTP)katlego