Normally, when programming a NANO via the discover webpage, I would get a "Success" message when it completed. Lately, I am getting error message: "The server provided an invalid message! Content-Length: 0". However, the board programs successfully. I have tried both Firefox and Chrome with the same results.
I don't believe this an issue with NB tools. I think our IT department made some change to the network that is causing this. But perhaps someone has some incite into what the issue might be. I used wireshark to capture the programming, and it looked normal. At the end, the module sends a 200 code about 4-seconds after the last data packet.