The remote host is missing a critical security patch or upgrade.
According to its HTTP banner, the remote host appears to be running a vulnerable version of Ipswitch WhatsUp Gold, a network management application for Microsoft Windows. It is reported that versions up to and incluing 8.03 Hotfix 1 are prone to a remote buffer overflow vulnerability when processing notification instance names in the web interface. An attacker may use this vulnerability to execute arbitrary code on the remote host.
Upgrade to WhatsUp Gold 8.03 Hotfix 2 or higher.