Access Security Guide K/KA/KB.15.15

Error messages
Error messages that may occur when executing secure-mode:
Initial check failure message:
This command can only be run on a serial terminal
Possible pre-check failure messages:
The default boot image is not set.
The default boot image must be the same image that is running
Standby Management Module is not responding
Active and Standby Management Modules are not in sync
The current software image was downloaded with an older software version and does
not have its signature. Download the image again.
After rebooting:
Secure-mode transition failed. Standby Management Module is not responding.
504 Secure Mode (3800, 5400zl, and 8200zl Switches)