I wasted my entire stupid day troubleshooting this stupid Arris modem

So I’m living elsewhere temporarily while my apartment is being demolished. I’ll be here until it’s rebuilt. Who knows when that’ll be. But that’s not the point. The point is that I have Time Warner Cable here and I’ve had the chance to use Road Runner for an extended period of time now. I’ve used Road Runner at friends’ homes several times in the past and had opportunities to do speed tests and the like, but I’ve never had the chance to use it on my own terms, with my own computers and home network equipment. I’m very upset at somebody — I know not whom — about a grievous oversight in the instruction manual for the DOCSIS 3.0 modem/router TWC gave me. The trouble is that I don’t know who to blame. It’s an Arris TG862G. Frankly, I had never even heard of Arris before they gave me this thing. The installer, who mentioned, by the way, that he has FiOS at home, said that the device is both a modem and a router, but that TWC doesn’t let customers change the SSID or the passphrase on the network, so if a customer wants to change that information, he or she must use his or her own router. I didn’t really care, since I do have my own router and I figured I’d just have to live with a suboptimal home network split on two different subnets (192.168.0.xxx on the Arris router and 192.168.1.xxx on my router). I didn’t think I was able to have TWC put the Arris in bridge mode since the TWC connection is on the account of the owner of the place in which I’m living (though nobody else will be using the connection). I figured I’d either do the 2 subnet thing or I’d simply use my own router as a switch and actually use the Arris router as a router. I figured I’d decide once I logged into the web configuration pages on the Arris and saw what features it had. If they compared favorably with my own router I’d just go ahead and use the Arris and use my own router as a switch (I have a real 24-port switch, but it, along with most of my stuff, is in storage until the apartment is fixed)

Anyway, the reason I’m angry is because either Arris wrote bad instructions or TWC made a slightly modified firmware for the Arris modem with an annoying feature. The manual says you can access the web GUI at, which of course is similar to most routers. I connected my computer directly to the Arris via Ethernet cable with nothing else connected to the modem but the coax cable and the AC adapter. I set my computer to get an IP address automatically to rule out the possibility that some pre-existing configuration on my computer was causing problems. I typed in the address, waited… and it timed out. After trying all sorts of other combinations (,,,, etc…) I finally figured out today (2 days of web searching later) that you can only access the web configuration GUI if you unplug the coaxial cable from the Arris modem first. If you have the coaxial cable plugged in and you try to access, it’ll just time out. The fact that this isn’t mentioned in the manual is a major oversight which caused me a huge pain in the neck. All I wanted to do was access the port forwarding settings page, which should be the simplest thing in the world but because I lacked this simple bit of information I had to go on a wild goose chase of searching through forums and support pages, none of which actually mentioned this. Hopefully posting this information will save somebody a bit of time configuring his or her Arris cable modem/router in the future. I just wish I knew whether it’s Arris that made this feature or if it was an adjustment that TWC does to the units they send to customers. I know that Comcast uses this same modem for some of their customers, so I’d be interested in learning if they also suffer from this “feature”.

P.S. The connection tests about 35Mbps/5Mbps to test sites in the NY/NJ area.

5 thoughts on “I wasted my entire stupid day troubleshooting this stupid Arris modem

  1. Same here with a ARRIS TM722B from the Austrian provider LIWEST. If I re-plug the coax cable access to the diagnostic page again is not possible.

    Cool feature of the my modem: system time is always 01/01/1970 so the concept of ARRIS’ password of the day is disabled.

  2. its or default not or or The is hard coded.

  3. This did not help with my crap arris mode. My wireless router is, so now every time I want to change my modem settings I have to take my entire wireless network offline and direct connect to a laptop.

  4. Just when I had some confidence in my self taught networking skill’s that have now beem crushed by twelve hours of this BS ! I will pull the cable from the modem and continue my pursuit of setting up my own network thank you for the tip. #modem is being tossed on to the Hwy
    PS you know what they say about Jersey
    …Fuk jersey.. . thanks again ….fluff in So Cal

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