Failure to connect to GUI

Likely this is due to a firewall somewhere.

Try disabling all firewalls under your control + see if your connection starts working.

Thanks, I did do that. I  ran a port scanner against it and it showed no open ports. I ran the scanner against a different device on the LAN and it was able to list open ports. I have ruled out my computer as the problem.

I have tried http://ip_address and https://ip_address:8089 and neither is connecting.

Have you tried http://ip_address:8089 too?

The Installation guide mentions that the WAN port should be connected to "the uplink port of an Ethernet switch/hub". Could it be that you connected to a normal port and your switch is not correctly auto-detecting the type of connection? It's very odd that the UCM6510 is getting an IP address from your DHCP server but is not accepting a connection from your browser.

In this situation, as a way to troubleshoot, I would connect a laptop directly to the WAN port (no switch, no network) and set the IP address on my laptop to something on the same subnet as the WAN address displayed on the LCD display of the unit. If necessary, I'd use the on-screen menus to put a static IP address on the WAN port. Then open a browser (Chrome or Firefox) on the laptop and see if it can open the GUI web page on the device. To make the connection I'd use an ordinary Ethernet patch cable, but if it still didn't work, I'd try an Ethernet cross-over cable. If neither works, I'd try a factory reset and re-test. If it still fails to connect after all that, contact the supplier or manufacturer because it must surely be a fault.

Thanks for the input experts, it would appear that the device had a problem and was replaced under warranty