Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Is there a way to prevent DNS lookups?

Posted on 2011-03-14
Last Modified: 2012-05-11
I have a system that a previous administrator "disabled" internet access on. Now we want it to have internet access, but I can't figure out how they did it. Here are the symptoms:

PC is configured for DHCP and receives an IP address and correct DNS entries.
PC can ping and tracert to any IP address.
PC cannot ping or trace to an external hostname: "could not find host XXXX"
PC can use nslookup to resolve domain names.

I'm thinking there is a registry key or some connection specific setting that was changed to prevent this. I can't figure out what is causing this issue.
Question by:leviatdr
  • 5
  • 4

Expert Comment

ID: 35132375
The easiest way to prevent internet access is the use of a proxy server in Internet Explorer.  Open IE, find Internet Options, typically under Tools or Privacy depending on the version.  Then to to Connections tab, and LAN Settings.  Uncheck the proxy if checked, and test.

Author Comment

ID: 35132451
I already checked that and there is no proxy set.

Expert Comment

ID: 35132474
Is the primary DNS server on the PC internal to the network?  It may be using some type of DNS proxy through forwarding, such as OpenDNS.  You could try setting DNS to an external server, and test from there to see if the problem lies with the server.
VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.


Author Comment

ID: 35132809
Primary DNS is on the same network. I set the DNS server to both the local dns server and resolver1 at opendns. Same results. I can nslookup but not ping by hostname.

Expert Comment

ID: 35133170
Does the server exhibit the same behavior as the workstation?

Author Comment

ID: 35133258
No, the server and other local workstations resolve names just fine.

After digging through the event viewer, I'm finding Userenv ID 1054: "cannot obtain the domain controller name for your network, an invalid argument was supplied". I know this is a DNS issue, but I can't figure out why nslookup works but standard resolution doesn't. Does NSLookup bypass the local resolver?

Accepted Solution

vervenetworks earned 250 total points
ID: 35133289
You may try to reset the TCP/IP stack using WinSockFix http://www.softpedia.com/get/Tweak/Network-Tweak/WinSockFix.shtml

NSLOOKUP does bypass the local DNS cache, and directly queries the primary DNS server.  You can specify an alternate server by using the command "server <servername or IP>"  My bet is a broken stack.  Any antivirus software or local firewall software you could try disabling as well temporarily.
LVL 26

Assisted Solution

akahan earned 250 total points
ID: 35134969
If you go to

Control Panel / Network Connections , right-click on the NIC you're using, choose Properties, choose Internet Protocol (TCP/IP), click the Properties button, click the Advanced button, and then the DNS tab, do you see anything unusual?

Tried uninstalling and reinstalling the NIC?  Uninstalling and reinstalling the TCP/IP protocol?
Ensuring that the firewall is not blocking UDP packets to port 53?

Author Comment

ID: 35138640
Winsock fix did not resolve the issue. I'm going to try reinstalling the NIC to see if that helps.

Author Closing Comment

ID: 35159608
Issue unresolved. User formatted machine. Thanks for trying.

Featured Post

Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
DNS Connector Delivery 5 74
windows explorer default details view 10 80
MMC - Computer Management / Display Properties 3 28
Mouse not working on HyperV / Windows XP Mode 4 71
Issue: Unstable cursor in Windows XP and Windows runs extremely slow in that any click will bring up the Hour glass (sometimes for several seconds before giving you what you want) . Troubleshooting Process and the FINAL FIX: This issue see…
Resolve DNS query failed errors for Exchange
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…

790 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question