G18 | G20

I’m trying to set up a site using my new SurfBoard G18 with XAMPP.  I was able to successfully open port 80 to outside traffic -- and verified that these ports were open with canyouseeme.org (see image) -- and ran the Apache web server, only to be met with repeated connection timeouts every time I attempted to connect to my external IP address.I poked some more around my router settings and found that certain security levels found in the Firewall settings would block or at least threaten to block HTTP ports (though I’m not sure this was part of the problem). I turned the router’s firewall off just in case. There were no changes and I still only got timeouts trying to use port 80.I experimented

Turned on bridge for G18 now i have no internet 

Just got my G20-6118. Tried to set up and while the primary green light at bottom lights up, neither my phone, via app, nor computer, will recognize device. I am using DECCA, which is somewhat priority to my community, and only access. On my old Motorola, it works fine, was trying to upgrade. Thanks

Have not been able to connect my printer to new modem router.  Printer works on 2.5g and has wifi WPS button

DHCP is not provisioning any clients on the LAN side.I had the modem activated via the ISP and when I manually set a static ip on the LAN network 192.168.0.20 with gateway and DNS settings, the internet works fine.But DHCP is not working. It does not work when I connect to the WiFi or when I plug directly into the modem with an ethernet cable. Any ideas? I’ve already tried disabled ipv6 and still nothing. No IPV4 addresses are being handed out via DHCP I checked to see if I can do a firmware update, but I don’t see any way to do that.

I can’t get into the Arris - Login.  I activated the Surf Board mobile app, but it only asked for my email, and did not ask for a password.  When I access the site, it asks for an email, and won’t let me type admin for a user and use password to login.  How do I find the password?  I tried doing a factory reset as well.

Just plugged in new surfboard device but it's not connecting to Wi-Fi 

I just got my surfboard G20 set up and running. Can I go in somewhere to change the password? The app just doesn’t work for me at all. I had to have my cable company activate the modem/router on their end since the app won’t let me. 

I will not have a mobile phone for downloading mobile app for installing device. How can I install device without a mobile app?

I purchased a modem on 3/10/25 at Best Buy. The modem stopped working correctly. Went to Best Buy on 4/12/25 to return. Was told it was past the 15 day return policy & we needed to contact Arris directly to return the item & get a refund. How do I go about doing so?  Thank you!

I have an Arris G18 router, trying to connect an Etekcity smart outlet.  Would like to see a detailed log of why it is not able to connect.  The logs I see do not have any information on devices connecting. 

I’ve had my cable guy come out. I’m connected to the cable/internet . I’m trying to set up modem/Wi-Fi and cannot get it connected to my PC with ethernet cord.

My TCL tv will not connect to Wi-Fi modem but my phone and the neighbors tv will. My TV will connect to a mobile Hotspot. So the how do get my TV to connect to my router 

Rename my router and add new password. 

Called my provider they activated device on my network I go through the steps all the way to the end tells me I’m good I can connect to the modem but it is not providing connection even though my provider said it is receiving connection not really sure what else to do 

New G18 I've had provisioned by xfinity appears to be repeatedly attempting a firmware update, it'll start with the solid amber “receiving power" light, then switch to a blinking amber “firmware update" light, then a blinking green “aquiring downstream / upstream signal” light and then a solid blue light which should be where it stays but it'll quickly return to the blinking amber stage and then repeats everything again. I've tried factory resetting it multiple times but it does not help. I've considered that maybe the upstream or downstream power levels or SNR are too high or low but they all seem within specI was on the phone with Xfinity support for an hour when I initially got it and they could not determine an issue on their end, after leaving it for a night it fixed itself for a couple days but has started doing it again after a power outage.

I don’t have a laptop to connect to the modem. Is there another way to get past this step?

I have tried to change to the device and Cox flags it as not supported. When I have them do it by phone it will not connect to the internet. 

how do I personalize the password for my Arris SurfBoard?

I cannot find the new G 20 in the mobile app to set it up?  

How to conect my modem i can't 

when I scan the QR code on the bottom of my new G20 it says “no usable data found”.  Haven’t been able to connect to the internet however the G20 is showing as connected and secured in my settings. 

Not tech savvy. Purchased a G20 at the recommendation of Best Buy for gaming. I have a 600mbps plan. I'm only getting 6 download and 1 upload after swapping my previous router-modem. Talked to ISP and they're not sure. Is there a setting I need to change? I didn't see one on the website for the modem-router. Any help would be appreciated. Thanks. 

Won’t accept my passwork when I attempt to use 5G, I’m only able to use 2.4 on my Arris G20 modem

Hi all,I purchased a Surfboard G20 to utilize DOCSIS 3.1 from Xfinity, but it’s been nothing but headache so far. After connecting it and activating via the Xfinity App, I’m only able to access specific URLs. Notably, any Google domain (like Youtube or Gmail) as well as wikipedia. No other websites will load at all. I called Arris support and they said it was corrupted firmware and had me exchange the modem/router at the place I purchased it. I did so, and the replacement has the same exact behavior. I spent 4 hours on Xfinitys tech support chat, and they have no idea what the cause could be. I suspect it’s some kind of DNS problem, but I’m not savvy enough to be able to isolate it further. A windows 10, Linux, Android, and ChromeOS device all share this behavior so I’m absolutely sure it’s not specific to any device. If it helps, here’s the output of an ipconfig:Ethernet adapter Ethernet: