Isp.0047.0018v1 Aborting connection from /[IP address..]: Connection reset

I get numerous logs in my server logs, as follows:
[ISP.0047.0018V1] Aborting connection from /[IP address…]: Connection reset

Just to brief you of the environment, we have 2 IS in cluster receiving service request with https calls from external systems via load balancer.

The system that invokes the service gets an http rejection error message on their end with the above message logged in IS logs.

Any clue where the problem is?