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Netscaler 5500 reports DNS effective state DOWN

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I have been battling with this for a few days:

Netscaler is not able to resolve host names. DNS servers are configured and can be pinged from CLI.

Netscaler is configured on same LAN as DNS servers.

Netscaler 5500 9.3: Build 48.6



DNS server1:

DNS server2:

From the CLI I can ping internal and external IP Addresses but not hostnames.

CLI results:
> show dns nameserver
1) - State: DOWN
> show dns nameserver
1) - State: DOWN

> ping www.yahoo.com
ping: cannot resolve www.yahoo.com: Host name lookup failure

Any help is much appreciated.


Edited by: JOHN SHELSTA on Jun 9, 2011 4:52 PM

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  • 9 years later...
On 6/22/2011 at 5:17 PM, John Shelsta 2 said:

Thanks for all the responses... The issue was Subnet IP had IP address conflict. Once I got an IP from client that was not in use by another device, DNS worked perfectly.


Thanks for the tip.


In my case there also was an IP address conflict responsible for the name servers being down on Netscaler VPX.

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