Using Modbus Slave program

I am using Modbus slave program to test my AB 9001-B Modbus TCP/Profibus gateway, and I get this
message from the Modbus slave program ( se attached file). It is not possible to turn off the firewall ( company restrictions). What to do?

This issue has nothing to do with the Anybus device. You would have to consult with the documentation for the Modbus Slave program.