Display the devices3.xml file and check the EZServe device entry against mine shown below and look for anything unexpected. You are particularly interested in the ID= value to be sure it is the Insteon address of your EZSrve and that the Status= field is 0. To Display the devices3.xml file, click on List Files on the Server Configuration screen. This will display a separate window with the list of xml files in EZSrve. RIGHT click on the devices3.xml entry and select Open in new window.
The 64 link record limit mentioned by SCSweet is a known limitation for which SHN is actively working on a change. Look at the number of link records listed under the EZServe device entry.