Tan, Kian Tiong wrote:

> Currently I am having a child proxy to chain to parent proxy. However I
> see errors when I test it on the web browser.


> While trying to retrieve the URL:
> The following error was encountered:
> Unable to determine IP address from host name for www.mozilla.org
> The dnsserver returned:
> Name Error: The domain name does not exist.


This means the child proxy is having DNS resolution problems. Test DNS
resolution on the child proxy using dig. If dig fails, then make sure the
child proxy is configured with the correct DNS servers and is allowed to
query them.

Adam