The remote host is vulnerable to a Denial of Service (DoS) attack.
The remote host is running ZoneAlarm, a personal firewall for the Windows platform. The client is running a version of ZoneAlarm that is less than 6.1.737.000. This version of ZoneAlarm is reported to be vulnerable to a number of flaws that can render the firewall unuseable or, in some instances, give the users a false sense of security.
Upgrade to version 6.1.737.000 or higher.