S33 | S34

I used my S33 v2 at a previous address and registered it with Arris at that time. It was on a Spectrum network.I’ve moved now and using the same S33, however, now on Xfinity. When I log into SURFboard Central it is still showing my Spectrum as my provider and I can get no data from the unit.How do I get this all reset? I’ve recently reset the modem which had no effect, I am assuming this issue is something with the SURFboard central app.

Always get message “We were unable to locate your serial number. Please check your model number and serial number and try again. This information can be found on the label in back or on the bottom of your device.”Model: S33v2Serial: 34D548332303943

I got an S34 a few months ago to replace an older DOCSIS 3.0 Arris modem on Xfinity to get higher speeds, and this model is recommended for my address by Xfinity.   It worked fine for a few months, but then in the past couple weeks started dropping connection multiple times a day, sometimes recovering on its own, sometimes requiring a hard reboot.  The logs show a lot of connection issues: REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided ValueRNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWSYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;RCS Primary DS FailureVarious other T3 failures It runs fine often all day at max speeds, then in the evening and/or early morning it drops out with uncorrectable errors and struggles to resync with Xfinity.  Often I need to hard reboot it.  Xfinity tech was here today and removed an old filter and splitter in the block which

The browser-gui for my S33v2 modem recommends using the SURFboard Central app.  When I download the app on my android and create and account, login, the application doesn’t tell me anything other than the model number, serial number, mac address, service provider, hardware spec, and ethernet ports. All of which I already know and have on the outside of the machine.  Even worse, it doesn’t give me any information that the browser gives me like  status, configuration, even logs, etc.  This is the only information I get;So far the app is worthless.  Am I doing something wrong; is there a link I don't know about?  What should I be expecting?

Hi. I’m being pulled around by Xfinity support telling me I cannot receive higher upload speeds since my S34 is actually S34v1 that has not been certified by Xfinity. I can find nothing relating to S34v1 versus S34. Xfinity will not provide me any documentation of their claim. Is Xfinity telling me the truth?

I am trying to set up an Arris S33 with Liveoak fiber internet service and the unit never stops blinking green. tried resetting it twice and it only goes back to flashing green. doesn’t go into pair mode or set up mode.

Multiple Level 1 Technicians have promised a callback from Melvin, Supervisor for Arris Technical Support Tier 2 Team, for several days on end. No callback has been received. Arris has been shipped back an S33 modem with power cord for a full refund per that agreed upon, but no meaningful response has been received from Arris. The Arris case number is 2412-06033.

Does Surfboard work with Verizon?

I got a new S33 modem because my old one the SB6190 seems to be failing because the internet speeds are all over the place. My router is the Orbi AX4200 or RBR750. The highest speed I was able to attain on the old modem was 750mbps but it’s usually around 500mbps. Optimum service is 1gbps.The S33 is activated with my ISP Optimum but it won’t handshake with my router AX4200. The light on the front of the modem is blue.What am I missing?Your help is appreciated.

https://1drv.ms/b/c/e9ed3dab60ad9a96/EVWUd4IjOJVOqYfwressD3YBPvYlXWRWvNyoJ6S961PWpw We are experiencing daily connectivity issues. I have attached a current event log for reference. 

Set up S33v3 per the instructions.  Called internet provider and gave MAC ID.  Light on surfboard was orange, then blinked green, then blinked green and blue.  Cannot get solid green light.  Have repowered and reset several times.  Can never get past blinking green and blue.

My Arris 34 is missing the OFDMA channel. I did have it, but then it disappeared.  Log from my Firewalla router. See attached 10/15 upload speed good at 346mbps. That’s what is supposed to happen. On the other days you can see the upload speed hits a ceiling <85 mbps. Software/Firmware from Xfinity is the latest. Xfinity tech came out and put his field test modem on my line and indeed showed 2200 down and 400 up, but this S34 modem isn’t buying it.  What can I do here?   

I have Xfinity.   They give my Fortinet 61F a IPv6 /60 block.   All the prefix delegated address are on the Fortinet.   I can’t send out IPv6 traffic.  I get these errors on the modem.  10/14/2025 09:44:07    Critical    No Ranging Response received - T3 time-out;CM-MAC=(Edited private information);CMTS-MAC=(Edited private information);CM-QOS=1.1;CM-VER=3.1;10/14/2025 09:18:02    Warning    TCS Partial Service;CM-MAC=(Edited private information);CMTS-MAC=(Edited private information);CM-QOS=1.1;CM-VER=3.1;10/14/2025 09:18:02    Critical    Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=(Edited private information);CMTS-MAC=(Edited private information);CM-QOS=1.1;CM-VER=3.1;10/14/2025 09:17:34    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=(Edited private information);CM-QOS=1.1;CM-VER=3.1;10/14/2025 09:

I bought an S34 but it doesn't have a port for my home phone service. What can I do? 

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I just today bought and then installed my new surfboard S33 cable modem. I used my ISPs activation site (breezeline) to try and activate. It mostly seems to be connected, I get a steady blue light on the modem itself, but I can only connect to my ISPs website. When I use my browser to connect to the modem via 192.168.100.1 it shows as connected and operational. However, whenever I try to access any other site, I'm met with a 'your connection is not private' (I'm on chrome). The specific error is 'net::err_cert_common_name_invalid'. If I try to download Firefox, I'm redirected to my ISPs website.  I have already talked with tech support from breezeline who said everything looks OK on their end and that it may take up to 24 hours for 'signals to synchronize', but it's been about 5 hours since I activated it and the idea of it taking 24 hours seems absurd.  One last thing, I had originally bought a hitron modem and tried to install yesterday and ran into the exact same problem, I thought

Hello,      I am experiencing a few minutes of disconnection for at least once and up to 4 times per day now.  I suspect that it is due to my internet service provider is sending a bad configuration file to my modem which causes it to lose connection for a few minutes.  This is because the event log in the modem indicates that there was a bad TLV code in the configuration file.  I am unable to convince WOW to fix this since they are overly eager to replace the S33 with their own no name brand and charge me $10 a month for renting it.  Is there a way to see the configuration file that was sent so the team at ARRIS can suggest a fix?  I’m including the log errors that repeat 4 times a day generally at the same time of day.   Are there any ways to get the WOW technical support to even look at the log files (they have refused so far).  Anyway, any ideas would be appreciated…  By the way I work with RF equipment and the signals are good, low code error rates 40 dB SNR….  The last time I cal

We have Xfinity 500 mbps using an s34 and a netgear mr60 mesh system. Rarely get more than 250 mbps

I am pretty certain I know the answer but wanted additional validation. I purchased an Arris S34 because my old Motorola MB8600 was having some issues and figured I might as well go with the latest with improved uploads. Initially the Arris S34 worked great and I was getting upload speeds of 320mbps which was impressive but would then lose connection after 30 minutes and rarely reconnect on a power reset. After dealing with Xfinity offshore level 1 tech hell for several days I had another tech come out to my house who indicated the tap box needed to be replaced. I reconnected my MB8600 and ran the Spectrum Analyzer. It's noisy and uneven. Around 400 MHz and again near 950–1000 MHz. Above 950 MHz, the signal sharply falls off to the noise floor. Screenshot: (edited personal information)Event log:      Time Not Established     Critical (3)         CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.       Time Not Established     Critical (3)         SYNC Timing Synchronization failu

I can’t find my SS ID

I places an order for a S34 Modem this past weekend, but have not yet received a confirmation email.  Checked spam folder and nothing.  I did receive a “Tell Us What You Think” Review email from Arris, but no order confirmation email Please advise,Thank you

my wireless printer will not connect 

I purchased a SURFboard S33v3 modem a few months ago, but recently it frequently drops connection. I have tried multiple resets without success. My ISP confirmed that the line is fine and the issue is with the modem. After swapping the modem, my internet has been stable, which further confirms the S33 is defective.I would like to request warranty support for the S33. However, when I try to submit the request on the warranty page, it keeps saying that the model does not match the serial number. Could you please assist me with this issue?

​@SURFboard Support ​@SURFboard Moderator I am getting the following message when trying to check the warranty status of my S33 modem:“We were unable to locate your serial number. Please check your model number and serial number andtry again. This information can be found on the label in back or on the bottom of your device.”Please help me correct this error so I can get support with my failing modem.

I suspect there is an issue with using the 2.5Gb Ethernet port on my Arris S34 modem at an actual 2.5Gb speed, I have repeated extensive testing which I'll summarize here, but I'm happy to go into more detail if needed. My ISP is Xfinity and I have been using the S34 modem without issue, getting around 940Mb downstream and 180Mb upstream via my 1Gb home LAN.  I wanted to upgrade my home network to 2.5Gb (some parts are already 10Gb) so I invested in some 2.5Gb hardware (NIC, switch, new CAT6 cabling, etc.) and while all devices are connected and working as expected at 2.5Gb (verified via iPerf3), I am not able to use the 2.5Gb port on the Arris S34 at the expected speeds. I have tried several different 2.5Gb NICs and they all exhibit the same behavior: S34 1Gb port connected to 1Gb NIC = no issues, 940Mb downstream.S34 2.5Gb port connected to 1Gb NIC = no issues, 940Mb downstream.S34 1Gb port connected to 2.5Gb NIC = no issues, 940Mb downstream.S34 2.5Gb port connected to 2.5Gb NIC = o