Comcast DNS

@BoulderJeff Hey, Jeff. We're seeing no issues with the resolvers across our footprint. If there's a specific name that is problematic or other details you can provide, we're happy to take as look.

Comcast's 75.75.75.75 DNS server is down and not resolving, and is taking down a big portion of the web. #comcastdown

@johnathonm Yes, please. We'll take a look and get back.

@ComcastDNS may I DM you?

@johnathonm @comcastcares If it's DNS, we'll take a look. DM us the details. You may have to follow us first.

@ComcastDNS Hello, I have been dealing with an issue for weeks and dealt with so many parties. Many calls, and even have drilled and captures probably 14 abuse, cpi,csc. The list goes on Iana took it seriously, level 3 agent. Anyway, I need help with a record. @comcastcares

@seanjmccurdy @seanjmccurdy Can you send us a DM?

@ComcastDNS I need help! Nobody at business support seams to know anything about your nameservers. Our domain is using NS1.COMCASTBUSINESS.NET for its nameserver - how do we make DNS changes? Is there a control panel somewhere?

@hunterro @Register_com Issue seems to be resolved. - JC

@ComcastDNS and @Register_com Have you teams made any progress on the register.com DNS outage on the Comcast Network? We would appreciate an update. Thank you.

@mwzimmerman @Register_com @mwzimmerman @Register_com We've had issues reported with register.com and we've verified via third party tools that their authoritative Name Servers appear to be unreachable from various locations even outside of the Comcast network.

@ComcastDNS We are seeing an issue with 75.75.75.75 resolving addresses for an entire domain hosted at @Register_com name servers. The addresses resolve with other DNS servers without issue. Would you be able to take a look? If you PM me, I can send you the domain.

@WolfKeeper PM Sent.

@jasonwhipkey tigerweb.geo.census.gov is currently failing DNSSEC validation (dnsviz.net/d/tigerweb.geo…).

@ComcastDNS I'm having an issue with Comcast's DNS. I'm getting no results for tigerweb.geo.census.gov.

@SwiftOnSecurity @EricRichards22 Our monitoring systems show no hinkiness. Can you describe the issue in more detail?

@EricRichards22 @ComcastDNS

Sigh. Comcast seems to be doing some hinky things with DNS today. Cloud everything is great until your pipe to the cloud gets sketchy

@jpmens @wupeka I do see that 8.8.8.8 returns AD from many locations. Our resolvers are correctly returning SERVFAIL across our footprint. Other validating resolvers also return SERVFAIL (1.1.1.1/9.9.9.9/etc).

@wupeka @jpmens @wupeka Yes, We're here.

@jpmens "Comcast Network Management". Is @ComcastDNS here?

@Tekneek Comcast's own resolvers (75.75.75.75, etc) as well as Google's (8.8.8.8, etc) and Cloudflare's (1.1.1.1, etc) all perform DNSSEC validation and have no issues. This may be a problem with your resolver.

@Tekneek To see what a DNSSEC failure looks like, analyze dnssec-failed.org. E.g., dnsviz.net/d/dnssec-faile…

@ComcastDNS There seems to be a problem with DNSSEC validation for business.comcast.com : dnssec-debugger.verisignlabs.com/business.comca…

@trfry What is the domain name? Also, what is the error message you're seeing?

@LeThirst When you get a chance could you DM us? Thanks.

@LeThirst We are not aware of any issues currently, but I did pass this on to one of our internal contacts that may have a better insight.

@andrew_michels stream.radio.co is resolving properly in DNS across our entire footprint. If you wish to switch back to our resolvers and are still having issues we could help you troubleshoot further.

@ComcastDNS I couldn’t access stream.radio.co at all when connected to my home network (after always being able to). Phone and online support couldn’t figure it out. I just set my DNS servers to Google’s and am now able to access the URL without issue.

@Redbeard25 @comcast @comcastcares The issue has been corrected. Please try again and let us know if you run into trouble.

@ComcastDNS @comcast @comcastcares Thanks... I tweeted you because you seemed like the farthest-into-the-network twitter account. My ESPN is showing up just fine. 🤣😇

Hey @comcast @ComcastDNS @comcastcares - my Facebook image requests are getting stuck in New Jersey.