Cant access certain subdomains via comcast

[pcm81]

Having a strange issue. I own a domain and always was able to see it and any subdomain i create on that domain through comcast or any other ISP. About 3 weeks ago i created several subdomains and am still not able to access them through comcast ISP. I can access all other subdomain via comcast, i can access the new subdomains via Verizon wireless on my cell, but cant access new subdomains through comcast. Any ideas what can cause this?

 

[Mr Evil]

You can check if the domain is resolving ok, assuming you use windows, with nslookup by typing the following at a command prompt:

C:\windows\system32\nslookup yourdomain.example.com

If that returns the wrong IP address, you could try flushing the DNS cache, with this command:

ipconfig /flushdns

If that still doesn't work, you could try changing your DNS server (you'll have to look up how to do that yourself). Google's is a popular one as it's easy to remember 8.8.8.8. If that fixes it, it might be your ISP's DNS server at fault.

 

[pcm81]

You can check if the domain is resolving ok, assuming you use windows, with nslookup by typing the following at a command prompt:

C:\windows\system32\nslookup yourdomain.example.com

If that returns the wrong IP address, you could try flushing the DNS cache, with this command:

ipconfig /flushdns

If that still doesn't work, you could try changing your DNS server (you'll have to look up how to do that yourself). Google's is a popular one as it's easy to remember 8.8.8.8. If that fixes it, it might be your ISP's DNS server at fault.

yeah, i figured it is the isp dns at fault. Wondering if i have to change something in server config... The new non-resolving subdomains existed for 3 weeks... My concern is that other comcast users cant get to new subdomains.

I am on linux, so no windows file system.

nslookup however produces:
Non-authoritative answer:
correct ip listed
when i search for subdomains that resolve; and it produces:

Server: 127.0.1.1
Address: 127.0.1.1#53

** server can't find newsubdomain.mydomain.com: NXDOMAIN

when i serch for "new" subdomains

 

[mxnerd]

Who hosts your DNS servers and who hosts your subdomain servers?

There are many DNS tools on the internet that probably can provide some trouble shooting.

https://www.google.com/search?q=dns+tools

 

[pcm81]

Both (domain and dns) are hosted by awardspace.com
All subdomains have identical dns settings. In all cases the dns is ns1.awardspace.com or ns2, ns3, ns4.awardsmace.com
If i set the ip of ns1.awardspace.com as my custom dns server in my router, then new domains resolve. if i revert back to isp dns the new subdomains stop resolving after i clear local dns cache.

Technically speaking i can't set dns servers for subdomains in awardspace user gui. I set it for my domain, notr individual subdomains.

 

[pcm81]

It's almost feels like comcast stopped updating or talking to name servers from awardspace ns1.awardspace.com etc.

 

[mxnerd]

DNS propagation didn't work and did not propagate new subdomain info to Comcast DNS servers?

But seems awardspace.com has changed its name servers to ns5.awardspace.com & ns6.awardspace.com?

https://www.awardspace.com/kb/host-existing-domain/

https://www.awardspace.com/kb/host-existing-domain/

Have you contacted awardspace.com tech support?

 

[pcm81]

I contacted awardspace, but have not heard back yet. Interesting to note that new subdomains resolve through verizon 4G network... so it now seems like some issue between awardspace and comcast. Not sure how long comcast keeps DNS records, but my old subdomains still resolve via comcast, its just the new ones, 2 weeks old, that fail.

 

[pcm81]

The registrar record for my domain still calls out ns1.awardspace.com as DNS servers (well ns1 through ns4) and when i set ns1.awardspace.com as my dns server in my local router it resolves the new subdomains... so in theory it should be all working.... but...

 

[mxnerd]

If you can't resolve the issue with awardspace, you can use other free DNS services to host your DNS

https://www.keycdn.com/blog/best-free-dns-hosting-providers

https://www.youtube.com/results?search_query=free+dns+hosting

 

[mxnerd]

Just checked. ns1.awardspace.com to ns6.awardspace.com were completely non functional.

Either using local machine's NSLookup tools or

online Nslookup tools https://networking.ringofsaturn.com/Tools/nslookup.php

couldn't even resolve big name websites like google.com, apple.com & ibm.com

 

[pcm81]

I believe the issue is with dns propagation from awardspace to comcast dns.
1. Site loads fine if i set ns1.awardspace.com as dns server. So no connection issues through comcast once the IP number is resolved.
2. Site still connects fine if i revert back to Comcast ISP DNS, AND keep local DNS cache.
3. Site will not load if i clear local dns cache and set dns server as Comcast default.
4. Older subdomains load through comcast dns, but newer subdomains, created in last 30 days, do not load if comcast is used as dns server provider.

Conclusion: The DNS information from ns1.awardspace.com does not propagate to comcast dns routing servers.

 

[pcm81]

Looks like it FINALLY propagated to comcast... I created the subdomains in question about 3 weeks ago... Just created a new test subdomain... interested to see how long it takes to propagate to comcast.

 

[mxnerd]

Use Opera browser with VPN feature turned on and visit your websites and check again.

I just used all of DNS servers of awardspace.com and none of them could resolve www.google.com

C:\WINDOWS\system32>nslookup
Default Server: one.one.one.one
Address: 1.1.1.1

> server ns1.awardspace.com
Default Server: ns1.awardspace.com
Address: 185.176.40.22

> www.google.com
Server: ns1.awardspace.com
Address: 185.176.40.22

*** ns1.awardspace.com can't find www.google.com: Server failed
> server ns2.awardspace.com
Default Server: ns2.awardspace.com
Address: 185.176.40.32

> www.google.com
Server: ns2.awardspace.com
Address: 185.176.40.32

*** ns2.awardspace.com can't find www.google.com: Query refused
> server ns3.awardspace.com
Default Server: ns3.awardspace.com
Address: 173.255.196.211

> www.google.com
Server: ns3.awardspace.com
Address: 173.255.196.211

*** ns3.awardspace.com can't find www.google.com: Query refused
> server ns4.awardspace.com
Default Server: ns4.awardspace.com
Address: 185.176.40.32

> www.google.com
Server: ns4.awardspace.com
Address: 185.176.40.32

*** ns4.awardspace.com can't find www.google.com: Query refused
> server ns5.awardspace.com
Default Server: ns5.awardspace.com
Address: 185.176.40.88

> www.google.com
Server: ns5.awardspace.com
Address: 185.176.40.88

*** No internal type for both IPv4 and IPv6 Addresses (A+AAAA) records available for www.google.com
> server ns6.awardspace.com
*** Can't find address for server ns6.awardspace.com: No information
> www.google.com
Server: ns5.awardspace.com
Address: 185.176.40.88

*** No internal type for both IPv4 and IPv6 Addresses (A+AAAA) records available for www.google.com
>

 

[pcm81]

I think awardspace DNS servers are authoritative servers, responsible only for their sites.

 

[pcm81]

I'll be dam... the subdomain i created 1 hour ago, is now resolving through comcast... I guess whatever it was with subdomains i made in February it was a glitch...

 

[mxnerd]

I think awardspace DNS servers are authoritative servers, responsible only for their sites.

Ahh, you were right.