I have taken over a DT85 programmed by someone else. I have connected to the DT85. I need to change some IP addresses as a new router has been installed.

I can't open the command box to change IP addresses.
I am steep on the learning curve here!
I get the message on the attachment.
I have opened port 843, still no joy.

Any ideas?

Hi wldlkdata,

That usually port 7700 was being blocked.

If you are using USB cable then a background program is using port 80 in your PC.
DTUsb will make a new arrangement to port 81 as well as swapping other port by 1 (including port 7700 into port 7701).

If you are using Ethernet connection, please check any blockage/ firewall setting on port 7700.

Best regards,
Rudy Gunawan