Hi EB,
Yes, I have tried different computers and different cables, I checked all the basics before flashing the firmware in the hope it was something silly.
When I enable wifi on my laptop, I am able to hit my home router's web interface using the same gateway IP. I've cleared all my cache and even installed Firefox which I have never used before to ensure it wasn't browser related.
When connecting to the RUT over Ethernet, I can reach the firmware upgrade and bootloader page entering 192.168.1.1/index.html and 192.168.1.1/uboot.html, it seems the RUT is only blocking port 80 traffic. I'll look at running wireshark to see what it captures.
I also tried both http & https, but it made no difference.
I tried to SSH into the router but get "port 22: Connection refused". I did not get the chance to enable SSH before the problems started.
Appreciate all the suggestions so far.