Sorry I did not mean to post this until I had added all info, not sure what happened, but here is my situation, I use predominately the TRB140 and RUT950 I have a number of uses for these mainly remote plant management and meter readings. The TRB140 I use to monitor heat meter output using a Three Sim and DYNDNS address I manage the device on port 90 and use port 80 to point to my meter reading device and this works great, I have to use port 80 otherwise my device does not work, I also use the RUT950 for plant management readouts and use port 80 to manage the router and port 90 to point to the plant controller, also using three sim and DYNDNS. All works great, however I would to replace the TRB140 with the RUT240 and find that although I can change the management port to port 90, if I try to route port 80 to my device it does not work, I get error 0 on the top left corner of the screen. This same situation happens if I try to do the dame thing on the RUT950. I have been asking for help with this for over a year and have no solution. The reason I want to use the RUT240 is the second port which can be used for network also and would be a useful trouble shooting port in the field. I have hit my head against a brick wall with this for best part of a year, tried numerous tricks and nothing works. Any help would be greatly appreciated.