Modems

I have a Chromecast and 2 Chromecast-compatible TVs and numerous devices that connected before we changed router. The TVs and the chromecast have no trouble connecting to the same WiFi but no devices are ever found. Also the TV’s app has a remote control option that also stopped working since we changed router on all devices.  I set the firewll to custom and made sure casting wasn’t blocked. I even turned off the firewall. Still no luck. Any suggestions?

I assumed when I bought this that I could run two ethernet cables from it at the same time because it has two ethernet ports. Just found out that is not possible. One can only run one at a time. Without having to physically switch cables, is there such a thing as a modem switch to multiple devices (i.e. desktop, router, personal server, etc.) without having to move cables?

I called in because I could not finish registering my g54 in the app. Was told to send in proof of purchase with the case number. Got the case number but can't recall an email address? Any idea what it is? Couldn't find it on the website. 

I have a new s33v3 modem. It’s solid blue and the cable company assures me the connectivity is good. It’s been registered to my account.  i have a google router that also is working fine when connected to the cable company’s modem.  however when i swap Ethernet cords from old modem to new modem, the router doesn’t work and doesn’t recognize the new modem.  I’ve of course reset all 1000 times.  please help. 

I have had the same issue. It worked well for a few days no issues and now we have to keep powering down modem and restarting it for the connection to come back. There are no issues with my internet provider and have never had to restart modem at least twice a day.

ever since switching from my xfinity router to this arris modem whenever im on a teams. google or zoom video call people can barely hear me its very frustrating 

I just purchased the S34 modem and never got an email confirmation.  I have a login and got some marketing email but am unable to initiate a chat, call or any means of contacting Arris. This doesn’t give me a warm fuzzy feeling.

Are the following events attributed to ISP or my SB8200, any help would be greatly appreciated Date Time Event ID Event Level Description 12/07/2025 23:12 2436694061 5 "Dynamic Range Window violation" 12/07/2025 23:12 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=(edited private information);CMTS-MAC=00:fe:c8:06:5a:40;CM-QOS=1.1;CM-VER=3.1;" 12/07/2025 23:12 73050400 5 "REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=(edited private information);CMTS-MAC=00:fe:c8:06:5a:40;CM-QOS=1.1;CM-VER=3.1;" 12/07/2025 23:12 2436694053 3 "SSH login failed from ." 12/07/2025 23:12

I purchased a refurbished SB8200v3.  I can’t connect it.  The Cox agent says it is still registered to someone else and she is unable to reset the modem so I can connect it to my account.  She referred me to Arris Support but I can’t find a phone number that is functional.  Anyone have a suggestion? 

Dear Arris,Many manufacturers of cable modems provide software control to reboot modems within their devices’ GUI.This has always been a helpful option, but gaining significantly more importance with the increased adoption of home automation systems.  It is becoming critical for users to establish automation routines to resurrect WAN connections to the internet after an ISP network, or electrical outage.Your SB8200 has the ability to reboot on command.I know this because:ISP help desks (e.g. Spectrum and others) can reboot the SB8200, and some even allow users to reboot their modems from their user mobile app You (or my ISP) altered the firmware, hiding the code in the modem’s GUI configuration page by commenting out the “reboot” button - AND - the onboard script checks for a user’s ID# if the form is submitted without using the form on the configuration page.Here’s the code you commented out, so it no longer dis

We cannot connect to the WiFi system

We have been using the S33 for our customers and they have worked well. We received S33v3 on our latest order but they will not switch from the default 42mhz upstream limit to the mid-split 85mhz limit. Do we need a new config file and if so, how do we get it?

Greetings,Brand new s34 and registered, activated with Cox existing service. The WAN syncs up, no problem. I am being careful to use only one ethernet port. According to my service plan.  Now if there is no WAN, the router stays on 192.168.100.1. once the DOCSIS connection is available, the strangest thing happens: the cable modem assigns private IPv4 network from the range of 172.16.169.0/27, for example: notebook receives 172.16.169.113; gateway of 172.16.169.97; netmask is 255.255.255.224. No IPv6 assignments. My Chromebook device is assigned one address, and the gateway router is listed under another address in the same network. But there is no internet access, and the despite the lights being blue, and no longer can connect to the modem on its management interface due to change in IPV4 addresses.  So I don't understand where a DHCP assignment could come with private IP addresses. And there is basically nothing to configure

I am considering purchase of a SURFboard S34.  My ISP does not like my current DOCSIS 3.1 modem, and blames failures of connectivity to the Internet on it.  In every case, the failures have finally proven to be caused by the ISP’s infrastructure.I am tired of the delay and conflict this causes.  I am willing to buy a S34 to stop that line of responsibility shirking.  What I do not want is for the ISP to then block features like the Event Log that I currently use to see what may be causing disconnects.Your thoughts and advice will be appreciated.

i need help setting it up with out a computer 

Surfboard SB8200,  replaced our old Arris with a new one and it won't connect to my Kindle. I tried adding a network but it won't connect. 

I just purchased the Surfboard S33v3 modem and worked with my ISP (Xfinity) to have it registered and connected. They mentioned they are getting signals and I verified through their app.The modem itself has a solid blue light in front of the modem and my ethernet cable going to router or any other device I attach it to has a green light (solid but flashes very quickly).For what reason, nothing is getting Internet still.Would appreciate any help. Thanks!

I was looking at starting to use a VPN for all my devices connected to my wifi. It seems the best way to do this is if the modem supports either OpenVPN or WireGuard as a client (instead of as a server). Does anyone know if this is true of Surfboard modems? I do have a Google router connected which is what my home devices use for Internet connection.

Internet just stopped, but it’s not the ISP. The modem Power light goes green then off and all the lights cycle on and off. This happens repeatedly. I have unplugged, reset, tried a new outlet. Could it be the AC unit that’s not getting the power to the modem? I can’t contact support because the site won’t proceed past “Check Warranty” with the Model # & S/N on the device. Not being able to get ahold of Arris is obnoxious!

How do I know the password or username 

Hello everyone, does anyone have any idea what this means ? When i go onto my router webpage( optimum is the cable provider) and go on the downstream connection page, which shows many channels, the latest is it says i am on channel 159 and it show a lot of corrected and  uncorrectables any ideas what this means? 

I have an Arris S33v2 modem with an unreadable serial number.  The label on the bottom of the modem is damaged, and the serial number and MAC address have been obliterated.  I cannot login to the modem directly, as the old default password “password” doesn’t work.  Apparently the new default password is the last 8 characters of the serial number, which I cannot read.How can I solve this problem?

My SB6190 modem started to randomly restart and I stopped using the device. I would like to submit a warranty claim but the website failed to identify registration number and model to get warranty status. I then I tried to register the product and save issue. The website failed to identify registration number and model again. 

I try to use live chat support but warranty checker unable to find my serial. 

Hello,I have an S33v3 modem that I purchased about six months ago.Since the thunderstorms at the end of September, the modem has been losing connection on the second upstream channel and is repeatedly showing T3 and T4 errors.My ISP (Xfinity) has already replaced all cables and splitters and performed maintenance on the street line. My neighbors’ modems no longer experience T3/T4 issues—only mine continues to drop the second upstream channel every few hours.Restarting the modem temporarily resolves the problem, but the issue always returns.I suspect the modem may have been damaged during the storm. Is this possible?And if so, would this be covered under the warranty? Also I try to find my warranty info but it says unable to find my serial number.