1. Confirm that you can ping those servers from the InTrust Console by short name, e.g. Server1 and by fully qualified domain name, e.g. server1.mydomain.myroot.com.
2. Confirm that you can ping the InTrust server from those servers by short name and FQDN.
3. Attempt to browse \\server1\admin$ and \\server1.mydomain.myroot.com\admin$ to confirm resolution as well as permissions to this share.