With IPHost Network Monitor you can run WMI Requests Not Found monitoring of various devices in your network.
To create a WMI monitor for Requests Not Found, provide host name (it must be a Windows host) and specify custom WQL query:
The number of requests for resources that were not found.
ASP.NET v1.1.4322 application performance counters
IPHost Network Monitor is an advanced and easy tool for monitoring LAN and WAN networks, network servers, workstations and TCP/IP devices. Use IPHost Network Monitor to monitor your servers, domains, computers and devices.