Modems

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?

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? 

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 

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?

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

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.

Front panel shows solid yellow lights indication stable connection (lights should be green/blue?), and router (ASUS) is fully connected and active (can be used with other modem). However, no internet connection available. I tried power cycling, but all lights return to solid with no connection available. 

I just bought a new monitor so I moved my modem and router to a different location, the router is working perfectly, but the modem is not. There's this solid amber/red light. Y reset it several times already. I unplugged it and plug it back to where it was at first but this is the problem, and there are this lights at the back, I really don't know much. Any help?

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

About 30 days ago purchased a SD8200. About every 1 or 2 days the MODEM will lock up. I can’t access it and must power cycle it to get it functioning. Event log messages concerning.27/11/2025 23:34:06    notice    CM-STATUS message sent. Event Type Code: 5; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=(Edited private information);CMTS-MAC=00:01:5c:81:a0:6d;CM-QOS=1.1;CM-VER=3.1;27/11/2025 23:34:04    critical    Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=(Edited private information);CMTS-MAC=00:01:5c:81:a0:6d;CM-QOS=1.1;CM-VER=3.1;27/11/2025 23:34:04    warning    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=00:01:5c:81:a0:6d;CM-QOS=1.1;CM-VER=3.1;

Hello I have an S33 that I need support on and the warranty checker can’t verify the serial number.  I need to troubleshoot some IPv6 issues I’ve been having with Spectrum. Thanks!

My SB8200 modem has stopped working. When plugged in nothing happens, no lights. We just had a storm so we unplugged it before the power went out (which it did). Now that the electricity is back and we plugged it back in it is apparently broken.Do I need to get a replacement or is there a way to fix it?

I have been connected to my S33 for some time. It got disconnected and then plugged back in. Light is steady blue as it should be but I am not able to connect to the internet. It is connected to the same router it had been and Im being told there is no available internet. 

Help

I am blocked from 192.168.0.1 and can’t get wps set up online so that I can wirelessly connect my printer to my computer.  PLEASE give me wps access/account or something for wps so I can connect my printer.

I bought a Surfboard S33V3 in Oct 2025 and installed with Breezeline with the 1 Gbps plan. The modem can only give me 80 to 200 Mpbs via cat6 wire connection. ISP asks me to enable the UPnP port on the modem. I logged into the modem admin page. I don’t see anywhere to change any settings, can only see status, event logs, etc. The web page asks me to use the Surfboard Central App and say I can configure my modem there.  I downloaded a copy of the Surfboard Central App, manually entered my MAC address and S/N. The app only allow me to see the modem mode, S/N, Mac address, and a link to the user guide. There is absolutely nothing else I can do or see on the App.  I also went to Surfboard support website and trying to find Arris support phone number or chat. It asks me to enter the model and Serial Number. After I entered the info, it tells me that it can’t find my S/N.  This is very frustrating to say the least.  Have I missed something?

My modem is making this awful high pitched sound. I have unplugged it into several different outlets and no luck. Help!!! This is super disappointing for a relatively new modem.

Been using the S33 for about a year with no problem. For the past month or so speeds have dropped to 11-12 download and upload. Status screen looks ok except for Downstream bonded Channels which are all in the -=5-7 DBmV range which I gather is high. Xfinity checked wiring outside and in and claims there’s no problem with their equipment. Partial event log follows. Is my modem toast? Is it really reaching back to 1969? Any advice appreciated. 31/12/1969 19:00:20 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=(Edited private information);CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 31/12/1969 19:00:22 3 CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz. 31/12/1969 19:00:25 3 No Ranging Response received - T3 time-out;CM-MAC=(Edited private information);CMTS-MAC=00:01:5c:b2:16:6b;CM-QOS=1.

How do I change my password on an older Model # SB6183 to prevent hacking on my data plan?

1.) Just Provisioned S33v2 Cable Modem With My Network Provider, Cox2.) Now Online On My PC3.) Attempted-Login-To-Modem, Using Default Username and Password4.) Error-Message-Entering-Default-Username-and/or-Password-Cannot-Login-to-Modem-192.168.100.15.) Error-Message: “username or password error, pls check them again” Help! Thanks and best, Guenther Bedoo

My SB8200 completely died yesterday. All the lights have gone out. I tried a new outlet, power cable, and factory reset. It will not power back on. I’ve tried to get in touch with customer support, but the website won’t recognize my Serial Number to start a chat or get the phone number. My modem is still under warranty. I bought it from Amazon within 2 years and have the invoice. How can I contact customer support to get a replacement? 

My modem keeps losing connection the last two days sporadically. I have had this modem for 4 years with zero issues and all of a sudden now we cannot hold a steady connection. ISP (XFINITY) tested connection to my home and said everything looked good except modem wasn’t online.  we have changed cables and unplugged and power cycled. Do we need a new modem or any other suggestions? What’s odd is it will not work for several hours then come back and work for 8 hours then again not work.