We help IT Professionals succeed at work.

We've partnered with Certified Experts, Carl Webster and Richard Faulkner, to bring you two Citrix podcasts. Learn about 2020 trends and get answers to your biggest Citrix questions!Listen Now

x

DNS queries in Windows XP Professional (SP2)

twixt
twixt asked
on
Medium Priority
208 Views
Last Modified: 2013-12-04
My firewall is logging frequent attempts by programs on my computer (such as Lotus Notes, Firefox or the Spooler SubSystem App (c:\windows\system32\spoolsv.exe) to communicate with (seemingly random) servers on the internet on port 53.  They are not attempting to access the DNS servers configured in my network settings.  

Does this mean that I have some sort of infection?  

I have scanned my hard disk with several anti-virus and anti-malware programs and have so far discovered nothing ominous.

Is there a way of discovering whether they are doing genuine dns queries or not?  I had a quick look at Ethereal for example.  Unfortunately with my level of knowledge the output was all greek to me.  (Make that ancient greek mixed up with higher, pure mathematics.)

Comment
Watch Question

Are they using TCP or UDP ? Grab the IPs and see if the IP is a legitimate DNS server

The most likely cause is that your configured DNS server has a forwarder that sends you to another DNS server

Commented:
Hi Computron,

check the ipconfig and network settings for those computers, and see what are the primary and secondary DNS servers over there. make sure that they are your local DNS server.

Cheers!

Author

Commented:
Hi Computron

I hadn't paid attention to that earlier, I wasn't logging that.  But having a look at the past half an hour or so, it appears they are using UDP.  I'll check further when I am online a bit longer.


Hi imnajam

I have looked at the network settings.  The network adaptor has two DNS servers assigned by the ISP.  But these programs are trying to contact servers (I assume) which are not configured.


Thanks
Commented:
PAQed with points refunded (500)

GranMod
Community Support Moderator

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts
Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.