We help IT Professionals succeed at work.

PC's slow after domain controller replaced

Last Modified: 2012-06-27
I've replaced a domain controller for a client of mine. This is the only server they have.

Here are the roles I transferred over to the new box: dns, dhcp, dc, gc, pdc, pid, schema master, domain naming master, infrastructure, etc.

Since I've made the move and powered off the ORIGINAL domain controller, the users are running rather slow. Logging into the PC takes forever (even tho I have DNS on the machine pointed to the server). The machines are generally just running slow, as if they are looking to the old server for some reason.

What am I missing? What information can I provide to help out?

Watch Question

I encountered similar issues when our network switch was dying.  I replaced the switch and the logon process worked so much faster!  Another potential is to run ipconfig /flushdns.
AwinishSenior Solution Architect

Consider one machine first,

Important, user machine should point their preferred dns server to your new server.
Secondly check the connectivity & process utilization on one machine.
Check ping is continous w/o any drop means RTO should not be there.
GC has been configured with universal group membership cachig enabled.
Name resloution is working fine using nslookup.

Lastly check for virus issue.
There can be n no of issue for slow logon.
You have to troubleshoot & segregate the issue.
If users are using roaming profile,whats the size of their profile?
How much CPU utilization is reaching.



Here is the error I recieve when doing an NSLOOKUP from the problem PC:

C:\Documents and Settings\pam>nslookup
*** Can't find server name for address Non-existent domain
*** Default servers are not available
Default Server:  UnKnown

How do I resolve that? perhaps that's my issue?
Senior Solution Architect
This one is on us!
(Get your first solution completely free - no credit card required)
Bill CochranDeveloper/Analyst

I assume is your new domain controller ip address?  Can you give me more specifics.  When you say slow, do you mean primiarily for surfing and using network resources....fast opening local files?  Have you reviewed the event viewer logs on the client and the server?


Awinish, you are a smart man!

It was indeed missing the reverse lookup zone ip subnet! I've added it, and can do a proper "nslookup" from a client PC. Login time was much much faster. I am calling her and having her test the system now!

Will keep you updated :) Thank you so much!

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

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


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.