We are troubleshooting a possible problem where a Modbus TCP client is supposedly not closing Modbus TCP connections with the Modbus Master, and after a while the Modbus master rejects any further attemps for TCP connections. The thing is, that we do not know which TCP client might be the culprit.
What would be the proper way to capture and filter TCP flows between two hostos to verify if the Modbus TCP connections are being properly closed (and thus not left "hanging" using up resources)? Not sure if this can be done with the "conversation" feature or some other way?
Tank you in advance for any advice you can provide.