When I upgraded two RUT955 to latest firmware RUT9_R_00.07.00, the RS485 Modbus gateway stopped working.
IP filter setting does not allow the old setting 0.0.0.0/0 but it is still suggested.
At first after upgrade IP filter was reading 0.0.0.0/0 but it is not possible to save the settings .


I tried setting up a port forward manually to 192.168.1.1 and it worked on one of the two upgraded units.