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After an extensive amount of time with chat support, they confirmed that typical methods are not working.So... either the new IP assigned to me has a blacklist issue, or something happened on the back-end after the maintenance and Xfinity needs to be
Can't connect to some servers (login, games, and website servers)
After what appeared to be a large scale infrastructure maintenance in my area by Xfinity a week or two ago, I've begun having problems connecting to servers. I can't connect to some login servers due to port issues even though I know I'm clear within the modem settings. An example is I can't login t
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How can I file a request for reverse DNS for my comcast bussiness mail server? For help with a Comcast Business account, see https://forums.businesshelp.comcast.com/. Please be aware that there are 2 kinds of responses in this Forum: Replies and
How can I file a request for reverse DNS for my comcast bussiness mail server
How can I file a request for reverse DNS for my comcast bussiness mail server?
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Our internet has been going down every night for the past month
It all started to act up about 3-4 weeks ago where at night around 12:00 to 1:30 the internet would go down afterwards I would try to reset the modems and the internet would come up for like 3 min again. Then it would go right back down again resetting it and troubleshooting it haven’t changed anyth
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Customer Service
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Considering Bridge Mode
I'm considering using the Bridge Mode on my gateway to have more control over my network. Before I go and buy a router, I just wanted to ask if there's any requirements the new router would need, or will any router work? Specifically, I'm planning on changing the DNS to Quad9's, putting ExpressVPN o
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Your Home Network
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Xfinity IP Address blocked by Spectrum when trying to use SMTP
I have a visitor staying with me from out of state, and he's trying to send email through his ISP (Spectrum) via SMTP, but I'm seeing the following error message when he attempts to send an email: READ Apr 17 10:46:19.309 [kCFStreamSocketSecurityLevelNone] -- host:mail.twc.com -- port:587 -- socket:
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12/03/22 Had a conversation with a 3rd level support staff. Very nice person but unfortunately with no technical insight into the interface and configuration of email for Apple mail. He just sent a link that was sent before to information about Outl
SMTP server configuration for Apple mail (and related issue)
I use an Imac that was configured years ago to use Comcast for Apple mail. I have 3 Comcast email addresses using POP3 for incoming mail. 3 days ago suddenly (zero configuration changes, upgrades, etc.) my main email address started refusing to send mail. It does receive incoming mail. The other two
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I have the exact same modem and it took comcast forever to configure it correctly. I sent the 1st one back because tech support couldn't getting working correctly, so they said it may be the modem. Installed the 2nd one and they still couldn't get it
Netgear CM1150V Internet Connectivity
Bought a Netgear CM1150V Cable Telephony Modem to accommodate my new Xfinity Gig Service on 8/26. Had lightning fast speed (945/48) for about 10 days until internet connectivity began to falter while streaming Xfinity TV on my tablet. Internet speed went down to ~1-5mbps/0 mbp. Rebooted and factory
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I am getting the exact same. I can prove it without doubt my issue is external from my house. I have a Cisco 9300 switch and 3802 WAP's, a 7Signal Sapphire Eye is saying my internet (wired) is less than 1mbps. The absolute highest recorded was 21m
High Download, Non Existent Upload Speed Issue. Chat Rep Literally Told Me "Good Luck"
I'm getting unstable high and low download speeds. Done ALL of the standard troubleshooting of my network connectivity, but Comcast support refuses to escelate my issue and get me to speak to a technical support agent to acknowledge the outage or poor signal issue in my area. Getting fluctuating dow
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@user_5f452f Are you a Spectrum customer or a Comcast customer? If you're no longer a Spectrum customer, does Spectrum allow you to keep your Spectrum email address? Please see https://www.spectrum.net/support/internet/understanding-email-error-c
Spectrum Email on Xfinity Wifi - Third Party Mail Client - Outbound mail stalled in outbox
Spectrum email address having issues with when attempting to send emails through third party clients when on my Xfinity wifi. Spectrum says it is an Xfinity problem. Xfinity says it is a Spectrum problem, both say it could be a 3P client problem. No issues sending mail via the browser. Issue occurs
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@EG Yes, I'm aware of that. There are however other knobs to turn on a device connected to it. Are all of the DNS requests hijacked? That's not clear if you can perform a dig or nslookup directly to another name server, but as far as
advanced security
Comcast has recently begun blocking an IBM subdomain: dhe.ibm.com. I spent 2 hours on the phone with support last night. No joy. It acts like a DNS problem, but I wondered if Advanced Security might be blocking it. So I went to turn it off and I can't see how. When I get to the Advanced Security tab
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... If I go into a CMD windows an try to lookup that address at the Comcast DNS (nslookup public.dhe.ibm.com 75.75.75.75) I get a timeout. ... Running that command on my Comcast Internet service with a retail modem and router (not rental equipment
advanced security
Comcast has recently begun blocking an IBM subdomain: dhe.ibm.com. I spent 2 hours on the phone with support last night. No joy. It acts like a DNS problem, but I wondered if Advanced Security might be blocking it. So I went to turn it off and I can't see how. When I get to the Advanced Security tab
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For outgoing server try using port 465 with SSL instead of 587 and see if that helps. For incoming, the errors you're getting sound more like DNS issues or something. Possibly your PC's firewall interfering with the connection. I know it is a gen
New errors with Outlook pop/smtp client
Help! I've been using Outlook as a pop/smtp mail client to my Comcast mailbox for >10 years and it was always smooth until recently. Now it barely works at all, sending & receiving. It got especially bad starting last Saturday 4/18/20. I tried calling Xfinity tech support but they're completely unhe
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Just saw this post. Sorry. I believe it can be tracked to a faulty Motorola MG8702. It first started with the DNS issues, but even after buying a Zyxel Router and turning the Motorola into a dumb cable modem in bridge mode, the Motorola stopped passi
Intermittent DNS Resolution - MG8702
I'm using a personal Motorola MG8702 for my router and have been using it with no issues since December 2020. Suddenly the second week of January 2025, all my DHCP client devices stopped being able to access the internet. I've tracked it down to the fact that the MG8702 has stopped relaying DNS requ
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I don't often check my Xfinity e-mail inbox, and since that is the only place Xfinity was sending any communications other than billing stuff, I just got the response notifications (yes, I finally found the "forward e-mail" setting). My follow-up is
Comcast DNS servers are dropping constantly (75.75.75.75 and 75.75.76.76) ... Revisited 2020
This post references a previous question post from 2013 of the same subject title minus the "... Revisited 2020". I tried to post new to that thread but apparently that is not possible, or not easy through Xfinity's interface (I'm a little new to RSS feeds). There may be a proper way to reference pr
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Port forwarding and very questionable phone support behavior
I've spent the past 3 hours attempting to what is normally a 5 minute deal with most hardware; set up a range of ports to forward. At this point I'm almost completely positive this is a known issue not just by the community at large but by Xfinity phone support as well. >Attempted to configure using
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Customer Service
Hey Amir, thanks for the reply. The article is helpful to an extent. With a lot of unnecessary tweaking, I have gotten the router to appear as a device under XFi from disabling the advanced security. However, it seems I can only forward basic port
Manual IP Port Forwarding
Is there any way I can manually set up a Port Forward using an IP address just as before? I have no idea why we are taking steps back in terms of features. This very simple "Select a Device for Port Forward" under Xfi is unnecessarily dumbed down. Especially since it is useless as it does not displa
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@mattejohnson wrote:Hi all,I’m having difficulty setting up my internet service. My modem is a CM1000 and I can’t connect to xfinity’s activation page. My computer is able to connect to the modem directly via Ethernet, I am being allocated a WAN IP (
Difficulty setting up modem - can’t connect to xfinity.com/activate
Hi all, I’m having difficulty setting up my internet service. My modem is a CM1000 and I can’t connect to xfinity’s activation page. My computer is able to connect to the modem directly via Ethernet, I am being allocated a WAN IP (running ipconfig on my laptop), I can ping my default gateway, but an
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@AMD6347 Replying to add to this: Within about 20 minutes of posting this, several aspects of my internet performance started going haywire. Due to router logs showing various attack warnings from comcast DHCP and DNS server addresses,
No Ranging Response received - T3 time-out every 2 hours
Hi, I see the T3 time-out every 2 hours, which causes a loss of connection. Once the restart has completed and I am reconnected, the connection is stable for another 2 hours. I see the following message in the event log after the modem comes back up: No Ranging Response received - T3 time-out;CM-MAC
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I'll throw out a few suggestions. Hopefully one of them will lead to a working MOCA network. MOCA works well for me but I don't have the complication of the Xfinity gateway. 1) in the past I've read that Xfinity MOCA doesn't use any security
MoCA Adapter Not Sending Internet
Just bought some ScreenBeam (ECB7250) MoCA adapters to get Ethernet running to my office. We have an xFi Gateway XB8 (Technicolor CGM4981) with MoCA enabled. All splitters have been upgraded to allow up to 1675hz. POE filter installed from street line into first 3-way splitter that goes to master be
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One of the reasons why I don't use comcast gateways. DNS is always wonky and you can't change it with their crippled gear. I dunno at this point. If you got an actual IP block from them, or just a timeout issue. Your stuff probably wo
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smtp authentication errors with postfix mail server
Hi, I've been using postfix mail server to send emails through your smtp.comcast.net server for my @gmail.com account for at least a year. Sadly, a few days ago, this quit and I am not getting rrors when trying to authenticate. Here is the log message: 2022-06-09T14:12:07.970428-05:00 phil postfix/q
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