With IPHost Network Monitor you can run WMI Number Of Free Connections monitoring of various devices in your network.
To create a WMI monitor for Number Of Free Connections, provide host name (it must be a Windows host) and specify custom WQL query:
The number of connections currently available for use
Counters for System.Data.SqlClient
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.