Agent Machines are unable to check in after the Protect Console was migrated to a different Machine.
When a Protect Agent is deployed, it is installed utilizing certificates that are based from the current Shavlik Protect Console. If a Protect Console has been migrated to a different machine without using the Shavlik Protect Migration Tool, these certificates will become invalidated and Shavlik Agents will no longer communicate with the Console or vice versa.
Discover and Re-install all Agents currently deployed from the newly migrated console. This will allow the newly installed console to create an association with the Agents.
Re-Migrate the Protect Console Using the Shavlik Protect Migration Tool http://www.shavlik.com/uploadedFiles/Support/Online_Documentation/Shavlik_Protect_90/mtg-prt-9-1.pdf