Synopsis
PVS has just observed a Modbus TCP 'force listen only mode' request.
Description
The remote client is running the MODBUS protocol. This protocol is common on SCADA or process control networks. NNM has just observed a Modbus TCP 'force listen only mode' request. An attacker can use this functionality to repeatedly disable the remote server from responding.
Solution
You should ensure that this sort of network traffic is restricted to protected networks only. Further, you should ensure that only valid clients are allowed to send commands to the server.