Olha só o que o squid retorna(pelo que entendi ele mostra que o erro e no named)

The requested URL could not be retrieved

While trying to retrieve the URL: http://redir.php/?

The following error was encountered:

Unable to determine IP address from host name for redir.php

The dnsserver returned:

Name Error: The domain name does not exist.

This means that:

The cache was not able to resolve the hostname presented in the URL.
Check if the address is correct.

Your cache administrator is root.
Generated Mon, 22 May 2006 02:15:16 GMT by ibsol (squid/2.5.STABLE6)

voce esta fazendo PROXY TRANSPARENTE ??

se tiver..

httpd_accel_port 80
httpd_accel_host virtual
httpd_accel_single_host off
httpd_accel_with_proxy on
httpd_accel_uses_host_header on