The underscore in the naming convention of the hostname (Server_1) is causing VAIM to discard the name. That is because "_" is out of the RFC Spec for DNS Naming.
So at this time the only options are as follows:
1. Rename server hostname to remove the "_".
2. Put the agent in unmanaged mode and manually configure the sysedge.cf file located under the PORT# folder for these hosts.