Question for Tech Gurus : DNS Resolution Failure - GoFuckYourself.com

2MuchMark · 09-27-2018, 06:48 AM

Greetings earthlings,

I was wondering if someone could help me out with a puzzle. When my GF connects her computer to our home network, our modem's error logs shows lots of errors that look like this

2018-09-27 06:48:52 ERR DNS DNS name resolution failure (isatap.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (teredo.ipv6.microsoft.com)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (wpad.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (wpad.corp.YYYY1111.org)
2018-09-27 06:48:53 ERR DNS DNS name resolution failure (wpad.corp.YYYY1111.org)
2018-09-27 06:48:55 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:55 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:55 ERR DNS DNS name resolution failure (casagsep1.corp.YYYY1111.org)
2018-09-27 06:48:55 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:55 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:56 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:56 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org)
2018-09-27 06:48:57 ERR DNS DNS name resolution failure (XXXX1111.corp.YYYY1111.org)

(I changed the domain listed above for privacy as she's not in adult).

Look at the time stamps - Her computer seems to be generating about 2 errors per second. The error log becomes so large after a while that it actually crashes the modem.

Any suggestions?

k0nr4d · 09-27-2018, 08:41 AM

Try disabling IPV6 on your router

2MuchMark · 09-29-2018, 08:18 PM

Quote:

Originally Posted by k0nr4d

Try disabling IPV6 on your router

Thanks but my modem doesn't seem to support it as I can't find any mention of IPV6 in my router. Just curious though did you see something in the logs above that makes you think its an issue with ipv6?

Marshal · 09-30-2018, 03:37 AM

Disable DNS on the modem for all the connections from the outside, reinstall her Windows (I believe that’s what she’s using) or Android phone, and disable modem error log. If that’s not working, either change a modem or an ISP. Good luck and keep us updated.

BigFurry · 09-30-2018, 05:01 AM

Looks like some app on her computer is trying to connect to nonexistent domains. It wouldn't be an issue if the modem wasn't buggy.

Option 1.
Set the DNS server in her computer's IPV4 settings to something else than the modem's IP.
Use the ISP's DNS server IP, or Cloudflare's free DNS (1.1.1.1), or Google's free DNS (8.8.8.8 and 8.8.4.4).

Option 2.
Manually add the bad domains to your OS to resolve as a local IP (127.0.0.1).
You can do it in the hosts file. If it's Windows, this one explains how to do it: https://www.thewindowsclub.com/hosts-file-in-windows

Option 3.
Block those domains in the computer's firewall.

Option 4.
Disabling modem log could be a solution too as suggested above.

2MuchMark · 10-01-2018, 08:32 AM

Quote:

Originally Posted by Marshal

Disable DNS on the modem for all the connections from the outside, reinstall her Windows (I believe that’s what she’s using) or Android phone, and disable modem error log. If that’s not working, either change a modem or an ISP. Good luck and keep us updated.

Re install Windows? Geezez...

I will check into the rest though, thanks!

Quote:

Originally Posted by BigFurry

Looks like some app on her computer is trying to connect to nonexistent domains. It wouldn't be an issue if the modem wasn't buggy.

Option 1.
Set the DNS server in her computer's IPV4 settings to something else than the modem's IP.
Use the ISP's DNS server IP, or Cloudflare's free DNS (1.1.1.1), or Google's free DNS (8.8.8.8 and 8.8.4.4).

Option 2.
Manually add the bad domains to your OS to resolve as a local IP (127.0.0.1).
You can do it in the hosts file. If it's Windows, this one explains how to do it: https://www.thewindowsclub.com/hosts-file-in-windows

Option 3.
Block those domains in the computer's firewall.

Option 4.
Disabling modem log could be a solution too as suggested above.

Thanks for the tips. Option 1 makes the most sense to me at the moment. Her computer though has tons of security policies and i'm wondering if switching to 1.1.1.1 may violate any of those. I'm sure its better for her, but need to make sure first. I'll check and let you know how it works out. thanks!!!!

raymor · 10-01-2018, 01:16 PM

Since you changed the names it's hard to know, but I'd bet her machine is trying to connect to a corporate network that it was set up with. That's the "ldap" part, ldap means "the company authentication server". You may want to remove it from the corporate domain if she no longer works there.

09-27-2018, 06:48 AM	#1
2MuchMark Videochat Solutions Industry Role: Join Date: Aug 2004 Location: Canada Posts: 48,650	Question for Tech Gurus : DNS Resolution Failure Greetings earthlings, I was wondering if someone could help me out with a puzzle. When my GF connects her computer to our home network, our modem's error logs shows lots of errors that look like this 2018-09-27 06:48:52 ERR DNS DNS name resolution failure (isatap.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (teredo.ipv6.microsoft.com) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (wpad.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (wpad.corp.YYYY1111.org) 2018-09-27 06:48:53 ERR DNS DNS name resolution failure (wpad.corp.YYYY1111.org) 2018-09-27 06:48:55 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:55 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:55 ERR DNS DNS name resolution failure (casagsep1.corp.YYYY1111.org) 2018-09-27 06:48:55 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:55 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:56 ERR DNS DNS name resolution failure (_ldap._tcp.SRASv2-Oakhill._sites.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:56 ERR DNS DNS name resolution failure (_ldap._tcp.dc._msdcs.corp.YYYY1111.org) 2018-09-27 06:48:57 ERR DNS DNS name resolution failure (XXXX1111.corp.YYYY1111.org) (I changed the domain listed above for privacy as she's not in adult). Look at the time stamps - Her computer seems to be generating about 2 errors per second. The error log becomes so large after a while that it actually crashes the modem. Any suggestions? __________________ Custom Software \| Server Management \| Integration and Technology Solutions https://www.2much.net

09-27-2018, 08:41 AM	#2
k0nr4d Confirmed User Industry Role: Join Date: Aug 2006 Location: Poland Posts: 9,228	Try disabling IPV6 on your router __________________ Mechanical Bunny Media Mechbunny Tube Script \| Mechbunny Webcam Aggregator Script \| Custom Web Development

09-30-2018, 03:37 AM	#4
Marshal Biz Dev and SEO Industry Role: Join Date: Jun 2005 Posts: 15,148	Disable DNS on the modem for all the connections from the outside, reinstall her Windows (I believe that’s what she’s using) or Android phone, and disable modem error log. If that’s not working, either change a modem or an ISP. Good luck and keep us updated. __________________ --- Busy ranking websites on Google...

10-01-2018, 01:16 PM	#7
raymor Confirmed User Join Date: Oct 2002 Posts: 3,745	Since you changed the names it's hard to know, but I'd bet her machine is trying to connect to a corporate network that it was set up with. That's the "ldap" part, ldap means "the company authentication server". You may want to remove it from the corporate domain if she no longer works there. __________________ For historical display only. This information is not current: support@bettercgi.com ICQ 7208627 Strongbox - The next generation in site security Throttlebox - The next generation in bandwidth control Clonebox - Backup and disaster recovery on steroids

09-30-2018, 05:01 AM	#5
BigFurry Confirmed User Industry Role: Join Date: Nov 2003 Posts: 1,554	Looks like some app on her computer is trying to connect to nonexistent domains. It wouldn't be an issue if the modem wasn't buggy. Option 1. Set the DNS server in her computer's IPV4 settings to something else than the modem's IP. Use the ISP's DNS server IP, or Cloudflare's free DNS (1.1.1.1), or Google's free DNS (8.8.8.8 and 8.8.4.4). Option 2. Manually add the bad domains to your OS to resolve as a local IP (127.0.0.1). You can do it in the hosts file. If it's Windows, this one explains how to do it: https://www.thewindowsclub.com/hosts-file-in-windows Option 3. Block those domains in the computer's firewall. Option 4. Disabling modem log could be a solution too as suggested above.