I can't get this router to connect to my ISP (comcast). My ISP is be providing me with an IP address, I have just a basic residential account - from what I understand this means that basically all I have to do on the RTU240 side is just set the protocol to DHCP and it should take off from there? If I plug my computer directly into the ISP, it works fine, if I plug my other router directly into the ISP, it works as well. I'm on the latest firmware (1.14), and just did a factory reset.
The ISP is connected directly into the WAN port on the RUT240 and I get flashing green, but there is a red X on the WAN port.