Chapter 2 of the SunScreen EFS 3.0 Reference Manual states that HA is supported only in routing mode. SunScreen EFS 3.0 supports HA in routing mode and in stealth mode.
When you activate the configuration for HA in stealth mode, the console displays a list of error messages. You can disregard these messages; the Screen is functioning properly. For more information, see "Error Message When Activating HA Stealth Configuration (4252244)".