Sep 202008

When you try to connect to server by fully qualified domain name (FQDN) which resides in top level domain (TLD) that has a purely numeric suffix, connection is failed. If server is domain controller issue also affects establishing trusts and domain joins.

When you try to PING server by FQDN you receive the following error message:

Ping request could not find host “FQDN of server”. Please check the name and try again.

Connection to the server by IP or by NetBIOS name is succeeding.When this issue occurs, all Domain Name System (DNS) records are correctly returned by NSLOOKUP. Therefore, DNS is fully functional and is not part of this issue.

By default DNS client service rejects resolution of DNS records in top level domain (TLD) that has a purely numeric suffix.

Procedure to Follow

To resolve this problem, add the ScreenBadTlds registry entry and restart DNS client service. Adding this registry entry prevents the DNS client service from performing the test to determine whether the top level domain is supported.

To add this registry entry and restart DNS client service, follow these steps.

1. Click Start, and then click Run, type regedit in Open box, and then press ENTER.

2. Locate and then click the following registry subkey:


3. On the Edit menu, point to New, and then click DWORD Value.

4. Type ScreenBadTlds, and then press ENTER.

5. Right-click ScreenBadTlds, and then click Modify.

6. In the Value data box, type 0, and then click OK.

7. Exit Registry Editor.

8. Stop and then start the DNS client service. To do so:

a.  Click Start, and then click Run.

b.  In the Open box, type cmd, and then click OK.

c.  At the command prompt, type the following lines. Press ENTER after each line

net stop DNScache
net start DNScache

d.  Type exit to quit Command Prompt.

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  17 Responses to “Fix for Ping request could not find host “FQDN of server” Error”

  1. This works great buddy……………thank you so much…………..

  2. This works. I was not able to open symantec, microsoft URLs. I followed the instructions, it worked.
    Thanks for helping :)

  3. Thanks a ton man. This indeed worked for me.

    Incase you would want to spread this learning far across, say on mobile then you can choose to use our tool, Drona – a mobile authoring tool. You can get it from our website.

    Thanks again.

  4. Excellent Post,It really works.

  5. Great Buddy it helps alot … Bravo

  6. i tried this but when i type net stop dnscache i get an access denied error

  7. please help! i still cant open some websites

  8. WOW,it greatly seems to be useful to resolve my problem.I’ll try this.Thank you very much.

  9. Excellent… Worked perfect for me.. ThanQ :)

  10. Did not work and screwed me up more. Before, my Vista wireless laptop cannot ping but can ping its IP, and firefox and IE do not work. My hardwired PC can ping both, and firefox and IE work OK on it. (Therefore, DNS config on laptop suspect?)
    After making suggested regedit, net stop DNScache produced ‘System Error 5″. I rebooted. Now wireless can not ping by IP (even after backing out the change to regedit and rebooting again).
    Now trying a system restore to get back to where was.

  11. hey i was using a virtual machin
    this is not solving the problem..!!

  12. Thnx alot it solved the problem…

  13. When i type net stop DNScache it returns:
    System error 5 has occured

    Access is denied. :(

  14. I’m having the same issue. Vista is hooked up via modem ->router -> laptop. Can’t browse w/ IE or Firefox, have a valid IP addy. Was able to browse in safe mode w/ networking and now I can’t. The network has connection. Able to ping IP of google and if I place the IP addy in addy bar, I can connect. I tried the DNScache step by editing the registry and stoping/starting srvs w/ no errors, however still can’t browse via FQDN. What else can I do???? Help

  15. If you are getting the system 5 erro in command prompt, try

    right click command prompt and Run as Administrator.

    The registry change did not fix my issue though.

  16. Thanks a lot! It worked for me. GOD bless you!

  17. Fantastic. very clear instructions and most importantly it fixed the problem. Many Thanks

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