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The service is working great but my gateway will not display the connected devices. Look at t...
The service is working great but my gateway will not display the connected devices. Look at the picture. The gateway will tell me that there are 16 devices connected but will not display the details.
There is no firewall, just a switch. DHCP is run thru the comcast gateway. Any ideas what is happening here? Tech support on the phone wasn't able to provide an answer
I can't see mine either which makes it a pain to knock particular devices off my network for troubl...
I can't see mine either which makes it a pain to knock particular devices off my network for troubleshooting. I haven't tried calling tech support yet. Just looking on the internet for help.
I just replied to your private message. Please send a response there.
I am having the same problem, my list of connected devices appears empty. I wrote down the MAC addr...
I am having the same problem, my list of connected devices appears empty. I wrote down the MAC addresses and assigned IPs when the list was visible, and those IPs still respond to connectivity tests with diagnostic tools, but I cannot handle that list any more. Furthermore, when I try to add a device with reserved IP I always get an "Invlid IP address" alert.
This is how it looks for me:
Unfortunately, the problem persists. Multiple clients connected, static DHCP mappings defined for d...
Unfortunately, the problem persists. Multiple clients connected, static DHCP mappings defined for devices which are online, but no devices are listed:
Hello, I’m encountering all the same issues/have attempted all the same fixes as previous folks (e....Hello, I’m encountering all the same issues/have attempted all the same fixes as previous folks (e.g. here http://forums.businesshelp.comcast.com/t5/Connectivity/IPv6-working-but-not-IPv4/td-p/25725)
I am running an Arris SBG-7580-AC which was purchased from amazon. I believed it was new, but suspect it was reconditioned after calling Comcast for activation indicated that it had been previously activated by another customer. Nonetheless, the Comcast folks seemed to have no problem re-requisitioning to my account. Once I began troubleshooting my connectivity issues (which have been present from the get-go) I suspected that the “dual activation” mentioned by Comcast_John in the prior post could be at fault. Comcast said call Arris about this, Arris folks weren’t quite sure what I was talking about, I’m still trying to escalate to someone who may be able to help me. Any thoughts? I’m a newbie to the forum so not certain how to DM someone like Comcast_John (someone had suggested sending him your MAC address), but perhaps someone could put us in touch?
For anyone else with similar issue, at long last this was resolved. I kept striking out with L...
For anyone else with similar issue, at long last this was resolved. I kept striking out with Level 2 techs on both the Comcast and Arris sides and ComcastPhil was exteremly helpful but ultimately could not identify a problem on his end. Finally someone up the escalation chain on Arris’s side reached out to an acquaintance tech at Comcast and between them, they were able to perform some sort of reactivation that fixed the IPv4 connectivity. I have no idea what they did and unfortunately the tech that informed me of the fix having been performed was just the messenger and unable to explain it either. It sounded like something in the Comcast backend that had to be fixed manually given how many times I attempted hard reset and/or had the device reactivated to fix the issue with no luck.
Best of luck to anyone else with this issue. FWIW, it seemed to be a problem unique to this one single modem. If this ever happened again I’d probably recommend cutting losses and replacing the modem with a new or different one. This was quite a month-long headache. Thanks everyone for the help.
Comcast offers a public wifi using their customers' wifi as the hot spot. Ever notice a wifi nearby...
Comcast offers a public wifi using their customers' wifi as the hot spot. Ever notice a wifi nearby with great signal that needs no password to connect to? Well that is 'xfinity wifi'
This allows people like myself to sign into your wifi for free by logging in with my xfinity email and password at any location in the world I see anyones 'xfinitywifi'... including yours. The problem with this is that is slows down your internet if the person using the xfinitywifi is being a bandwidth hog because it quite literally is your internet...
It wouldnt be such a pain if I could disable this setting on my own, like xfinity residential customers can by signing into their modem settings as an admin. However, comcast has chosen to disable this setting in the modem settings page for business customers. A bit strange in my opinion considering my business account bill is easily three times that of a residential customer.
The icing on the cake, is that yes comcast will disable this if you just call and ask... the problem is that as soon as you have to power cycle (reboot, or unplug) your 3939b modem, 'xfinitywifi' automatically restores its settings and turns itself back on for both the 2.4 and 5.0 GHz channels.
So I ask you this comcast, please allow me to turn this off at my own will without needing to call you and also dont turn it back on when i restart my modem because we all know how often we have to do that!
PS. While you're at it, allow me to disable AP Isolation because I can't use chromecast with this modem and it's hurting my business along with several other upset customers as is clearly shown in the multiple threads about the same issue! This is less than a 5 minute fix for both problems!
I have called twice to turn it off and was told each time it was done. It is still on and I w...
I have called twice to turn it off and was told each time it was done. It is still on and I want it turned off. Hey John, can you take care of this for me? Thanks
Hi Techtronyx. XfinityWiFi has been disabled. Please let me know if additional assistan...
Hi Techtronyx. XfinityWiFi has been disabled. Please let me know if additional assistance is needed.
HI PatsFan. Xfinity WiFi has been disabled in the Comcast Gateway. Please let us know if addi...
HI PatsFan. Xfinity WiFi has been disabled in the Comcast Gateway. Please let us know if additional changes are needed.
I need assistance logging into the business gateway -- the default highspeed is not working when I ...
I need assistance logging into the business gateway -- the default highspeed is not working when I use cusadmin as the User ID
im also having problems with the default passwords. they dont work
...gateway. Please private message me your full name, the service address and phone number associated on the...
Hi ead and welcome to the support forums.
I would like to assist with your gateway. Please private message me your full name, the service address and phone number associated on the account.
I followed the instructions in the Manage your XFINITY® WiFi hotspot online article to try and...
I followed the instructions in the Manage your XFINITY® WiFi hotspot online article to try and disable the hotspot. I did not have the Manage XFINITY WiFi Hotspot option is references though.
Could I please have help getting to this setting or getting the hotspot disabled?
If anyone's paying attention to this thread, and feels like disabling my wifi for me, I'd really ap...
If anyone's paying attention to this thread, and feels like disabling my wifi for me, I'd really appreciate it.
I'd even more appreciate the ability to disable this myself.
It is really unbelievable that a business such as Comcast would force it's customers into sharing their resources involuntarily.
I see that as a poor business practice.
Hello Heysoos223, Your Xfinity Wifi has been turned off. Please be aware if your modem r...
Your Xfinity Wifi has been turned off. Please be aware if your modem reboots then it will turn back on.
Hello court217 and welcome to forums. I have disabled the Xfinity Wi-Fi signal from ...
Hello court217 and welcome to forums.
I have disabled the Xfinity Wi-Fi signal from your Comcast Gateway. I also updated your business portal login so as to avoid this issue in the future. Please let me know if you need any other assistance. -MPD
I have a DPC3939B router with static IP's. I am running into a problem where (seem...
I have a DPC3939B router with static IP's. I am running into a problem where (seemingly on it's own) it is disabling the "Disable all rules and allow all inbound traffic through" Check Box/Setting. The log files confirm this and it is not related to any user logins. (See log below - Red Entry). In any case, the tsip_pm_enable setting is getting flipped every few days to every few weeks. When the tsip_pm_enable setting gets shut off, it causes all kinds of performance problems, and obvious security concerns. The logs do not seem to reveal any deeper insight as to the cause. Obviously, I WOULD like to end this behavoir! Any Suggestions?
GUI: User: xxxx login 2017/8/4 08:25:51 Notice [Firewall]: tsip_pm_enabled: 1 2017/8/4 08:05:10 Notice [PortManagement]: tsip_pm_enable set to: 1 2017/8/4 08:05:06 Notice GUI: User: xxxx login 2017/8/4 08:00:31 Notice [Firewall]: tsip_pm_enabled: 0 2017/8/3 21:27:43 Notice [Firewall]: tsip_pm_enabled: 0 2017/8/3 21:27:29 Notice [Firewall]: tsip_pm_enabled: 0 2017/8/3 19:57:48 Notice [Firewall]: tsip_pm_enabled: 0 2017/8/3 19:57:25 Notice [PortManagement]: tsip_pm_enable: 0 2017/8/3 19:55:41 Notice [Firewall]: tsip_pm_enabled: 0 2017/8/3 03:26:33 Notice [Firewall]: tsip_pm_enabled: 0 2017/8/3 03:26:11 Notice [PortManagement]: tsip_pm_enable: 0 2017/8/3 03:24:31 Notice [Firewall]: tsip_pm_enabled: 0 2017/8/3 03:15:06 Notice [PortManagement]: tsip_pm_enable set to: 0 2017/8/3 03:15:03 Notice [Firewall]: tsip_pm_enabled: 1 2017/8/3 01:50:29 Notice [Firewall]: tsip_pm_enabled: 1 2017/8/3 01:50:04 Notice [PortManagement]: tsip_pm_enable: 1 2017/8/3 01:48:27 Notice GUI: User: xxxx login 2017/7/31 21:58:00 Notice
Hello my-spot and welcome to forums, I apologize for the delayed response to your post...
Hello my-spot and welcome to forums,
I apologize for the delayed response to your post. I am not sure if it is an configuration issue on your modem or perhaps a poor response to a firmware update. I would like to factory reset your gateway to see if this helps. Pending the results of this reset we may need to send out a tech to replace the device. A factory rest can take up to 40 minutes to complete, do you have a preferred time for such a reset? (AM|PM)
Some one changed the login that is no longer with my company.. can you reset it automatically?
Hello autri and welcome to forums, i apologize for the delayed response. I have reset ...
Hello autri and welcome to forums,
i apologize for the delayed response. I have reset your modem to the default password "highspeed" without quotes. Please let me know if you need help with anything else.
Your modem password has been reset back to default.
Here is our setup: We have static ip addresses and the modem is in the bridged mode. We have only...
Here is our setup:
We have static ip addresses and the modem is in the bridged mode.
We have only 3 devices on the network:
1. Computer A with a web server and a dns server running Windows 10 pro.
2. Computer B with a web server, dns secondary server, and an email server running Windows 10 pro.
3. A netgear wireless router providing wireless to customers
Last week we moved from DSL to Comcast cable. Since the cable was installed we have an issue where the modem will reboot randomly.
Sometimes two or three times an hour, other times it may go several hours before rebooting.
We never had this issue with the DSL and the computers we had with DSL have not changed.
Comcast has changed the modem (Cisco DPC3941B) and tested the line thoroughly. Our upstream and downstream levels are perfect and they have not fluxuated for the entire time.
Our building has several other comcast customers and they have monitored them and us at the same time and none of them go down when ours reboots.
After ruling out the cable and modem as an issue, the next thing we did is look at our machines.
We removed the netgear wireless router but the reboot still occured.
Next, leaving the wireless router off, we removed Computer A, and soon the reboot again occured.
Next, leaving both the wireless router and Comptuer A off the network, we removed Computer B and waited. After 2 hours there was no reboot.
Based on this we conclued that Computer B is having an issue with the modem.
On Machine B is we shut down the Web server, DNS server, and Mail server the reboots seem to stop (we give 5 hours for a test as this is the longest we have gone without reboot since the beginning)
We then try turning on the mail server, and soon a reboot.
We disable the mail server and turn on the DNS server and soon a reboot.
We disable the DNS server and turn on the email server and soon a reboot.
No matter which server runs (alone) the reboots begin again.
We have scanned the machine for virus, malware and rootkit (as we do very often) and it is clean.
We have disconnected the ethernet and connected via wireless to the modem with the same result, so a faulty nic card has been ruled out.
Comcast has sent techs out 6 times in the 8 days we have had their service and they cannot find the problem.
One tech suggested "maybe it is an attack", so we set the network monitor on and waited for an attack and the network usage was unchanged immediately before a reboot.
Also it seems unlikely that an attack would reboot the modem, the modem logs only show the modem getting its address after it powers up again.
No other info is in the modem logs.
Can anyone suggest ideas on how to isolate this problem? Again the same equipment functioned over DSL without any issues for years.
Although comcast seems to be doing all they can (tech sat in my office for several hours Saturday morning as we monitored and tried different things unsecussfully), we obviously cannot functions with random 5 minute drops throughout the day. We process our credit cards through Computer B and when it goes down we are out of business until it comes back up.
We are encountering the same issue (random reboots) with a very similar setup. Comcast has replace...
We are encountering the same issue (random reboots) with a very similar setup.
Comcast has replaced the modem three times, has moved the outside cable, etc.
We have replaced our network equipment (switch, SonicWall, etc.) but the problem persists.
We're an IT company who provides network services & support to our customers, so we know what we're doing network-wise. (not bragging, just stating that we do this for a living)
When the modem reboots, no other equipment is affected.
Up until yesterday's massive Business Phone outage, our phones weren't affected by the Internet gateway reboots.
Since we use a VOIP system & VPN to connect to our other offices, this brings everything to standstill until the modem boots again.
One Comcast technician said he diagnosed something similar and that the "Maintenance Dept" had finally tracked the problem to the increase in X1 boxes because they send out a signal on the same frequency used to trigger modem reboots. However, no one else at Comcast appears to believe this.
This has been going on for a few months but everything was rock-solid before that.
We finally resolved this, however the solution may not be doable for everyone. After over 160 rebo...
We finally resolved this, however the solution may not be doable for everyone.
After over 160 reboots in 14 days, I asked the tech if he could get me another modem but NOT a Cisco DPC3941B. He went to their warehouse and got me a old no long used SMC modem, and since he did that, we have not had a single reboot in over 26 hours.
As a test, he left the Cisco DPC3941B installed and ran them in parallel over night and the Cisco DPC3941B rebooted while the SMC did not.
So our problem was resolved by getting rid of the cisco modem completely.
I am not sure if everyone will be albe to get the tech to dig up an old SMC modem, but if you can, it just might eliminate the reboots.
Hope this helps someone, even though we were ultimately unable to determine what was/is causing the cisco modem to reboot.
which is kind of useful...but also kind of scary. I want to allow Skype, have configured f...
which is kind of useful...but also kind of scary.
I want to allow Skype, have configured for remote desktop, but want to block torrents.
On the menu go to Advanced, Port Forwarding, there we see all of the automatically opened ports. Next to each entry is a check box, and Edit button, and an X. Uncheck the box, go to some other screen, come back, the box is checked. Delete the entry, go to some other screen, the entry is back. Create my own entry, uncheck the box, go to some other screen, come back, the box is unchecked.
1) Why is the DPC 3939B automatically opening ports? Can this be disabled?
2) How do I disable or delete ports that are automatically opened?
got an idea. tried and experiment. started a BitTorrent download on one of th...
got an idea. tried and experiment.
started a BitTorrent download on one of the computers. went to the Port Forwarding page. there were two new entries for BitTorrent for that computer. could not be disabled or deleted.
stopped the torrent download. entries could not be disabled or deleted (withtou returning from the dead).
closed BitTorrent. now the entries can be disabled or deleted.
tried another experiment. apparently this is all tied to the security level. at typical security (medium) the router automatically opens ports for skype, xbox, torrent, etc. as the applications ask for them. at maximum security (high) only necessary and related ports are opened. attempts to use BitTorrent are blocked and no new entries are seen in the Port Forwarding page.
a decent user guide,or even a somewhat knowledgeable phone tech, could have saved a lot of time and confusion.
...enable full firewall ports blocking especially for StaticIP devices. Then there is a special GUI True...
Hello megaabite and welcome,
Just to springboard off Comcast_John's post, Comcast only blocks these ports intentionally for networking and customer specific security reasons. However, all Comcast Gateways (CG) contain internal GUI FireWall control facilities that allow you to enable full firewall ports blocking especially for StaticIP devices. Then there is a special GUI True Static IP Port Management facility where you can maximize security on that device and ONLY open prescribed application required ports.
The DPC3939B firmware version can be found within GUI interface Software facility. It is my understanding that the DPC3939B GUI supports auto-control of the Xbox, Skype, uTorrent GUI entities. The reason for this is that customer's can connect whatever devices to the CG and then manually or auto-open any prescribed device ports as follows:
1. ) Xbox - " Xbox Live service uses UDP ports 88 and 3074 as well as TCP port3074, XBOX 360 and computer with AVG Firewall, please ...protocol TCP; direction In; local ports 3390; remote ports 1000-1300, etc."
2.) " Skype requires unrestricted outgoing TCP access to: All destination ports above 1024 (recommended). or. Ports 80 and 443, etc. "
3.) For uTorrent " It is generally recommended to not use any port in the range 6881-6889 or ports under 1025. Any other port except for 25 or 110 is acceptable."
Lastly, whenever you make any vital manual CG supported setting change, it is always good practice to insure permanent implementation by resetting the CGs and checking that it stuck on a permenant basis, like most industry standard modems.
Hope this helps you out.
We are using Comcast Business Starter Internet for our office and planning to buy a modem instead o...
We are using Comcast Business Starter Internet for our office and planning to buy a modem instead of leasing it.
I'm checking Comcast's website. It's showing the following modems are compatible for our service.
- Arris/Motorola Retail SB6120 SURFboard DOCSIS 3.0 Cable Modem
- Arris/Motorola Retail SB6121 SURFboard DOCSIS 3.0 Cable Modem
- Arris/Motorola Retail SB6121 SURFboard DOCSIS 3.0 Cable Modem
- Cisco DPC3008
- Cisco DPC3939B
- Netgear CG3000DCR
- SMCNetworks SMCD3G-CCR
Which one would be better for a small business?
When I search through forum, SB6141 seems not support Comcast Business. Then why this is listed in my search?
so which one would you recommend from the seven modems?
Has this been fixed yet? I would like to stop paying rental prices equivalent to buying a new modem...
Has this been fixed yet? I would like to stop paying rental prices equivalent to buying a new modem every 6 months but I have static IPs.
I bought a cisco for own use, as I do NOT want any modems with wireless even turned "off," and I wa...
I bought a cisco for own use, as I do NOT want any modems with wireless even turned "off," and I wanted the USB and ethernet. Multiple calls to Tier 1 customer service has refused to even look at the MAC or model number so far. They insist "we don't support ANY cisco models." Any advice for getting past tier 1 level? Thanks, wiredngrounded
Hello arcamm, Unfortunately in order to use a Comcast assigned static IP you must u...
Unfortunately in order to use a Comcast assigned static IP you must use Comcast equipment. At this time Static IP's are not available for use on customer owned equipment.