SB8200

need to reset PW

Hi everyone, I’m currently working with an Arris SB8200 cable modem and need some technical guidance. I'm trying to automate a WAN reset routine for my home network, but I’m hitting a wall with the device’s firmware behavior. Has anyone here worked with these modems to enable remote reboot capabilities or bypass the authentication requirements? Any advice on scripting this or alternative hardware solutions would be greatly appreciated.

SB8200 failing but website says serial number not foundMy SB8200 purchased in November 2021 keep dropping the connection since Xfinity upgraded things in the neighborhood. The connection keeps dropping. Xfinity says there is no outage. I've already upgraded the coax and splitters, etc. Still keeps dropping. It was running PERFECTLY FINE without a problem until they updated the neighborhood (Up to 10G). I cannot contact customer support due to the website saying my serial number cannot be found. I have tried entering it multiple times in different formats with no luck. To fix it, I just disconnect and reconnect the coax, and power cord, Then I am running fine for a day or so. Thank you! 

SB8200 will not power-up, no lights as of yesterday. Purchased Nov 2023. Power adapter had gone bad about 6 months ago. Power adapter reads that it’s giving out voltage, but once more, the modem is not doing anything.  

I’ve had two Ethernet ports activated on my SB8200 for a number of years. My ISP (Astound) says I’m still provisioned for two IP addresses. As of last evening (12/21/25), I only get Internet access through one address. Power cycling the modem sometimes results in it activating the other Ethernet cable connection. The lights on the cable modem flash showing “traffic” on both connections but only one at a time has an actual internet connection. I’ve bypassed the issue for now but need advice if this is possibly a modem issue or if I need to go back to the ISP again (15+ wait time on phone for support)?

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.

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

ordered last saturday, with faster shipping. my card was charged. i did not receive a confirmation or any tracking information. there is no way to contact anyone about this on the store website (really, just a ‘do not reply’ email ?!?)please respond: https://community.surfboard.com/members/surfboard-moderator-593 as you have to others with the same problem….what is going on ?

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?

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? 

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 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 

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. 

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;

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?

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.

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 was purchased two weeks ago, and it worked fine for few days then disconnected from WiFi signal, after restarting WiFi comes back. Checked with WiFi provider and no outage in the area, no service interruptions either. This is our second Arris modem that our first one didn’t have this issue. Requesting technical support or change the product. Thanks! 

There is a similar issue on this page.  As of a couple of months ago, I could no longer access Disney+ on my TV, computer, phone.  When I try the TV App I get an error.  When I try to use a browser, I get an error all of which point to me being outside of the Disney Region (Outside of the US). After a month we were able to diagnose that if we use our phones as a hot spot and were able to access the streaming services once again.  Disney suggested a VPN may be the problem.  Which I do not have a VPN.  So then pointed to the ISP as having an issue. So we contacted our ISP which could not diagnose the issue and is pointing at my equipment.  Their reasoning was that other apps work, but Disney+ does not, Netflix freaks out sometimes. My Internet equipment, Surfboard SB8200 connected to Netgear MK63 Mesh.My ISP is Optimum (Cablevision / New York City, Long Island, New Jersey Region).My wireless carrier is T-Mobile I re

Hi,Does my modem need a firmware update. I've never done it.P/N:(Edited private information)S/N:(Edited private information)HFC MAC ID:     (Edited private information) 

Recently got a refurbished SB8200.  Works great, stunning increase in speed over ethernet (50 to 170 Mbits per Speedtest.net)Less love for the brightness of the indicator LEDs.Apparently version 2 of this modem has the ability to change how the LEDs are displayed.  Sadly no LED dimmer function but having them turned of either all the time or when working normally would be appreciated.I assume I have v1 which does not have that functionality.How can I get a v2 modem? Is there away to determine by serial numbers? Maybe there is a firmware upgrade?If anyone has an answer I would appreciate it.Thanks - Jef

My SB8200 loses connection to Xfinity more and more often. It happened a couple of times during the first months, but now nearly every day.All lights are on.The modem web UI works. Performing a reboot via the UI does not help. I have to power it off/on. The signals look OK as per the Cable Signal Levels article. Thanks!