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S33 | S34

DOCSIS® 3.1 Gigabit Cable Modem

  • 440 Topics
  • 1,123 Replies
440 Topics
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WessyThe Many
asked in S33 | S34
Unable to add modem to Xfinity account

The Xfinity installer called his tech support and they speculate that the box the modem came in was never correctly scanned by Best Buy, where I bought it. They said the “mac address” is the problem, and that I have to take it back to Best Buy for them to scan it properly. Anyone else have this problem?

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plemans
Juggernaut
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sammynThe Many
asked in S33 | S34
S33 - upload speed limited to 45mbps

Hello,I’ve 1Gbps/350Mbps internet now. I bought S33v3 to support this tier since MB8600 didn’t work good with it. But the upload appear to be limited around 45Mbps. ISP tech checked everything and I couldn’t find a problem and said this modem doesn’t support the higher upload speed.  Based on the event log, I think the correct config is not in place because some issue with either modem or the provisioning itself. I can’t believe S33 can’t support higher speed.Can someone tell what’s wrong here ? Thanks you 02/03/2025 11:36:18 Error Improper Configuration File CVC Format02/03/2025 11:36:18 Critical Config File Rejected due to Invalid or Unexpected TLV 11;CM-MAC=X;CMTS-MAC=X:4b;CM-QOS=1.1;CM-VER=3.1;02/03/2025 11:36:18 Notice TLV-11 - unrecognized OID;CM-MAC=X:a3;CMTS-MAC=X02/03/2025 11:36:18 Warning MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-102/03/2025 11:35:55 Error Missing Mandatory MDD TLV on primary DS Channel;CM-MAC=X;CMTS-MAC=X;CM-QOS=1.1;CM-VER=3.1;MB8600 used to show 2

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The Many
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mdhirshThe Many
asked in S33 | S34
Incorrect username or password on S34

I keep getting the same error message using admin for username and password for the password for the web access. I’ve also tried admin for password (all lower case).I then did a reset with the button on the bottom. The modem rebooted, but it still won’t take the default username and password. This modem was new out of the package and is successfully connected with my spectrum internet. Device Status button works fine. Any suggestions? Thanks

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4MYcomputerThe Many
asked in S33 | S34
Arris Surfboard S34

I just purchased an ARRIS Surfboard S34 as I upgraded to 800 mbs speed.  I have internet connection with a constant blue light on the front of the modem but the connection on the back of the modem is flashing yellow. Xfinity says it is not a problem on their end. This modem was a recommendation from Xfinity.  What can the issue be?  Thanks for any help.

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Wi-Fi Warriors
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The Many
S33noiseismakingmecrazyThe Many
asked in S33 | S34
Noise pitch on S33

I have an active warranty and my s33 modem is making noises and driving my entire family mad. How do I file a claim?

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Wi-Fi Warriors
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The Many
DarkfallzThe Many
asked in S33 | S34
Wrong serial number on S34

I am just trying to register my Arris S34 and it keeps telling me the serial# is incorrect.

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Wi-Fi Warriors
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The Many
Char47The Many
asked in S33 | S34
reset button not workin S33

Need to factory reset my surfboard S33. Depressing reset button does nothing.  

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Wi-Fi Warriors
sargent knuckle
The Many
sargent knuckleThe Many
asked in S33 | S34
V3 indicates the 3rd firmware version on S33

Hello all, does the V3 after the product name ,for example S33v3 mean its the 3rd revision of the product, or does it mean its the 3rd firmware version of the product?

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sargent knuckle
The Many
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BalakcThe Many
asked in S33 | S34
Xfinity & Arris S33 and W121 Kit - slow speed issue

Hi,I have the following Arris Setup:Modem : S33Wifi Router : W121 Kit - Two W21 - SURFboard mAX Mesh Wi-Fi 6 system - AX6600 Speeds.My Xfinity Plan is 1200 Mbps download and 35 Upload.Everytime i run speedtest, i dont get more than 400 MBPS download & 30 MBPS upload.If i reach out to Xfinity, they are promoting the Xfinity Gateway for monthly rent.Any suggestions how to speed up using existing Arris S33 + W121 Kit Setup ?

1027
plemans
Juggernaut
D
The Many
DrewdownkaliThe Many
asked in S33 | S34
s33 high pitched buzzing for about a month

My S33 has been making an annoying high pitched sound for about a month.  The sound got significantly worse today and it stopped working. Plugged in my old sbg6580 and contacted my ISP and now I have Internet back. Arris expects me to have a cpu with an Ethernet port but not many laptops come with Ethernet ports anymore. Nether my laptop not my finances laptop have Ethernet ports. Arris says if I can't connect a computer to it there nothing they can do for me. Modem is still under warranty until Sept. 

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Wi-Fi Warriors
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MRJAEThe Many
asked in S33 | S34
WIFI USERNAME & PASSWORD on S33

I just purchased Arris Surfboard S33 and I need my WIFI Username & Password. It is not in the box.

1041
plemans
Juggernaut
B
The Many
bdunlap03The Many
asked in S33 | S34
S33 Constant Noise

I bought an ARRIS S33 2 years ago and just the other day it started making a horrible whining noise. Now it will not connect to anything. I get a red light and constant noise. I have unplugged and left it alone for hours and came back to try again and still it will not work. I wanted to contact support but the chat is down and there is no email/phone number. What can I do? My S/N states it is still within warranty. I bought an S34 for the interim while I try and get this fixed. 

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Wi-Fi Warriors
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ordernotreceived33The Many
asked in S33 | S34
Can't Login to S33 Web Interface

The only way I have logged into the web interface was with the coax cable disconnected. This isn’t helpful because it doesn’t show any data. I connect the coax cable and try again, browser says site can’t be reached and times out. Does Spectrum not allow access or something? This is my personal modem. Why can’t I access the web manager?

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Wi-Fi Warriors
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ajaxThe Many
asked in S33 | S34
how to log in s33v2

how to log in s33v2

441
plemans
Juggernaut
A
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alex85083The Many
asked in S33 | S34
S34 and Cox 2g are they compatible?

I purchased a new s34 for Cox because it says they work together. When I try to set up S34 on Cox I get an error message stating they are incompatible. This is for Cox 2g  Docsis 3.1 system. 

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plemans
Juggernaut
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The Many
Jaimie1981The Many
asked in S33 | S34
modem with apple tv on S33

I just activated my new surfboard modem S33 and my computer internet is working fine but my apple tvs are not even though they show connected to ethernet. Can you help with this?

261
plemans
Juggernaut
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The Many
jtdotsonThe Many
asked in S33 | S34
cell phone internet service blocked -just stopped working Model S33vs

One cell phone in our household has ‘privacy warning’ and cannot access the internet. Everything else is working fine including all other cellular devices in the network.   Cannot get online to see what is connected. Need to reset username and password on Arris and do not see where to send email to reset 

263
plemans
Juggernaut
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The Many
TaplitskyThe Many
asked in S33 | S34
S34 Firmware Update

On August 3, 2024, I activated my new Arris S34 modem thru the Xfinity app.This morning, I called Xfinity to ask, what’s my firmware update schedule.Xfinity said, Arris is responsible for that.Where do I go from here?Thank you!

5762
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Wi-Fi Warriors
C
The Many
charliebarryThe Many
asked in S33 | S34
S33 - help with new internet name

Installed s33 modem, should I not get a new internet name to set up in settings? 

391
plemans
Juggernaut
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SevignyDThe Many
asked in S33 | S34
S33 Loud buzzing squeeking noise

I bought my S33 in July 2023. A few weeks ago (Jan 2025) my S33 began making a noticeable buzzing/squeaking sound, which seems to have gotten louder. Hard to notice with TV on (right next to it) but in a quiet room its ultra annoying. Connectivity didn't seem to be affected though. To try to fix the noise I tried briefly unplugging it and plugging it back in. That didn't help. So, I tried to unplug it and let it sit for a bit, when I plugged it back in it gave me a white status light and makes a constant rhythmic buzz squeak now, no internet connection. Left it that way for several minutes and status/connection did not change. What's going on here?

794
plemans
Juggernaut
D
The Many
Doug801The Many
asked in S33 | S34
S33 Updates with Xfinity

Good morning, I have a ARRIS - SURFboard S33 32 x 8 DOCSIS 3.1 Multi-Gig Cable Modem. (Purchased Oct 2021) I switched to an Xfinity modem for a while due to a sales pitch.  I tried all day yesterday to get my S33 back online.  The reps at Xfinity kept telling me that there was an outage in my area. It wasnt an outage, my S33 apparently had some files that needed to be updated in the modem.  I spent 5 hours in chat mode with Xfinity and 5 reps. Xfinity indicated that the files were updated to teh S33.  How do I know for sure?  Is there a way to test it beyond connecting and activating the unit through Xfinity again.  What other options are possible to test the speed and operation of the modem?  I prefer not to go through that again.  Thank you all

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Wi-Fi Warriors
J
The Many
Jasonullrich75The Many
asked in S33 | S34
Corruption

How do I know if my surfboard is corrupted. The past 3 days I have lost service at 930pm until 930 am the next morning. I went onto my surfboard S33 to see if it would tell me anything and it said firmware NA and service provider NA which I thought was weird. It also wouldn't let me refresh, it said last refresh was November something but instead just kept rerouting my refresh attempt to this thing called Fing. Any help please.

351
plemans
Juggernaut
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The Many
peyermanThe Many
asked in S33 | S34
S33 Intermittent Dropouts

How can I get a longer timeframe of Event Logs on my S33v2? Have been having intermittent dropouts. I believe this is a cable supplier (Spectrum) problem vs. Arris. However, I would like to set up a computer on the modem via internet port to log various elements over a longer period of time. How can I do this vs. the somewhat short period of time the Arris logs events.If it turns out this is the Arris modem how can I get a warranty replacement? I do not have a backup modem so would need to continue to use this one until a warranty replacement is sent to me and then I would send to Arris.

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The Many
AqualungThe Many
asked in S33 | S34
S34 or Hitron CODA56?

Spec-wise they look similar. OTOH, I’ve seen people pooh-poohing the Puma chipsets in the CODA56. What's the lowdown on that?

11381
plemans
Juggernaut
D
The Many
DougsmarrThe Many
asked in S33 | S34
cannot get the internet to work on my tv

Can’t get my device to connect to the internet 

171
plemans
Juggernaut
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