When the DLP NW appliances are first added into the Enterprise Manager, a key is generated to enable secure communication between the appliances and the Enterprise Manager. Once the EM is re-installed the keys no longer match hence the devices can not communicate.

To resolve this issue the device can be reset rather than re-imaged. This has the advantage of retaining all network and other configuration data.

1, Log into appliance

2, Select option 6 "Advanced"

3, Select option 1 "Exit to shell"

4, At the command prompt type resetdevice

5, Follow prompts