With IPHost Network Monitor you can run WMI Requests Rejected monitoring of various devices in your network.
To create a WMI monitor for Requests Rejected, provide host name (it must be a Windows host) and specify custom WQL query:
The number of requests rejected because the application request queue was full.
ASP.NET 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.
