When making connections to MongoDB from the C++ client driver, in the order of thousands, connections get dropped rapidly. This leaves too many sockets in the WAIT state when monitoring with netstat -nat | grep WAIT.

This causes the application to be unable to create new connections to MongoDB and in turn becomes idle.

Also CPU usage increases to almost 80% of the test computer's capacity during this phenomenon.

During this process mongostat provides no insight as nothing database oriented is happening.