This change fixed a problem we had after a patch update to apache resulted in IE clients not being able to access one of our enterprise Java apps over SSL through an ISA firewall. The error seen in the ISA logs was: Error Code: 500 Internal Server error. The context has expired and can no longer be used. (-2146893033) By changing ssl.conf to only specify ssl-unclean-shutdown for MSIE 6+, the IE clients were able to use the application without errors.