Security Gateway might crash when disabling the SecureXL SIM feature "NAC" and restarting the SecureXL:
[Expert@HostName:0]# sim feature nac off
Feature will be disabled the next time acceleration is started/restarted
[Expert@HostName:0]# fwaccel off
SecureXL device disabled.
[Expert@HostName:0]# fwaccel on