Domain Names/Static IP
Managing, controlling, and support for Custom Domain Names
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Comcast DNSs are not recognizing our domain so all their users can't access out site or VPN

Hi,

 

All Comcast users use 75.75.75.75 and 75.75.76.76 as their DNS. These servers don't seem to recognize our domain name and it's records. All other DNS providers in world work fine. Please see below proof.

 

tech@MacBook-Pro ~ % dig @8.8.8.8 www.ntst.org
; <<>> DiG 9.10.6 <<>> @8.8.8.8 www.ntst.org
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37103
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
 
;; ANSWER SECTION:
www.ntst.org. 21599 IN A 198.57.151.37
 
;; Query time: 99 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Wed May 13 14:57:49 CDT 2020
;; MSG SIZE  rcvd: 57
 
tech@MacBook-Pro ~ % dig @75.75.75.75 www.ntst.org
 
; <<>> DiG 9.10.6 <<>> @75.75.75.75 www.ntst.org
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 12633
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.ntst.org. IN A          <== Doesn't return IP address.
 
;; Query time: 1411 msec
;; SERVER: 75.75.75.75#53(75.75.75.75)
;; WHEN: Wed May 13 14:59:03 CDT 2020
;; MSG SIZE  rcvd: 41

 

tech@MacBook-Pro ~ % dig @75.75.76.76 www.ntst.org
 
; <<>> DiG 9.10.6 <<>> @75.75.76.76 www.ntst.org
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 37136
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.ntst.org. IN A       <== Again, no IP address resolution
 
;; Query time: 983 msec
;; SERVER: 75.75.76.76#53(75.75.76.76)
;; WHEN: Wed May 13 15:00:08 CDT 2020
;; MSG SIZE  rcvd: 41
 
Another public DNS works fine.
tech@MacBook-Pro ~ % dig @9.9.9.9 www.ntst.org
 
; <<>> DiG 9.10.6 <<>> @9.9.9.9 www.ntst.org
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38323
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
 
;; ANSWER SECTION:
www.ntst.org. 21244 IN A 198.57.151.37
 
;; Query time: 57 msec
;; SERVER: 9.9.9.9#53(9.9.9.9)
;; WHEN: Wed May 13 15:00:59 CDT 2020
;; MSG SIZE  rcvd: 57
 
I opened up a case with Comcast but it's impossible to get Comcast DNS team on phone. I am stuck with support group that just reads scripts and keep resetting my modem each time I talk to someone. How can I get in touch with Comcast Engineering who can assist with troubleshooting this issue? At this point more than 600 of our end users use Comcast and our resources are not working for any of them.
 
Please help.
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3 REPLIES 3
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Official Employee

Re: Comcast DNSs are not recognizing our domain so all their users can't access out site or VPN

Hello, how are you? I hope outside of this internet issue your day is going well. I am sorry you are experiencing DNS server issues and a connectivity issue on your network. I know this must be a huge concern. Are you able to send over some account information in a private message so I can assist you further? To start working on your account may I please capture your first and last name, your account number (or phone number), and your full-service address?

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Re: Comcast DNSs are not recognizing our domain so all their users can't access out site or VPN

Apparently it was a known issue between Comcast and Register.com registered domains. I could never get Tier-2 support from Comcast on phone after spending 4-5 hours with tier-1 who wanted to keep blaming on my modem. I finally called Register.com and they said it was a known issue since yesterday and Comcast was working on it. It looks like as of 5:05CST, it is working now but I will have to wait till DNS cache flush. My TTL was set to 8 hours so have to wait on cache expiration time.

 

Same exact dig command that times out before is working now. Thank you for your offer to help.

 

tech@MacBook-Pro ~ % dig www.ntst.org @75.75.75.75
 
; <<>> DiG 9.10.6 <<>> www.ntst.org @75.75.75.75
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37460
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
 
;; ANSWER SECTION:
www.ntst.org. 21600 IN A 198.57.151.37
 
;; Query time: 93 msec
;; SERVER: 75.75.75.75#53(75.75.75.75)
;; WHEN: Wed May 13 17:11:29 CDT 2020
;; MSG SIZE  rcvd: 57
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Official Employee

Re: Comcast DNSs are not recognizing our domain so all their users can't access out site or VPN

I am glad it's currently working, and I apologize for the trouble. If this issue resurfaces or if you experience similar trouble we can collaborate with our advanced repair team to address the concern accurately. Thank you very much for all your time and patience. Do all you can to have a great day. 

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