Chapter 12 Load Balancing for FortiOS 5.0 : Configuring load balancing : SSL/TLS load balancing : SSL offloading : SSL offloading support or Internet Explorer 6
  
SSL offloading support or Internet Explorer 6
In some cases the Internet Explorer 6 web browser may be able to access real servers. To resolve this issue, disable the ssl-send-empty-frags option:
config firewall vip
edit vip_name
set ssl-send-empty-frags disable
end
You can disable this option if SSL acceleration will be used with an old or buggy SSL implementation that cannot properly handle empty fragments.