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Full Discussion: iptables & port 53 (DNS)
Operating Systems Linux Red Hat iptables & port 53 (DNS) Post 302625187 by in2nix4life on Tuesday 17th of April 2012 11:14:01 AM
Old 04-17-2012
Couple of questions?

Without the firewall, do you have connectivity to the DNS server?

What do the logs show with iptables running when you attempt the connection?
 

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REDSOCKS(8)						      System Manager's Manual						       REDSOCKS(8)

NAME
redsocks - rediect any TCP connection to a SOCKS or HTTP proxy SYNOPSIS
redsocks [options] DESCRIPTION
redsocks is a daemon running on the local system, that will transparently tunnel any TCP connection via a remote SOCKS4, SOCKS5 or HTTP proxy server. It uses the system firewall's redirection facility to intercept TCP connections, thus the redirection is system-wide, with fine-grained control, and does not depend on LD_PRELOAD libraries. Redsocks supports tunneling TCP connections and UDP packets. It has authentication support for both, SOCKS and HTTP proxies. Also included is a small DNS server returning answers with the "truncated" flag set for any UDP query, forcing the resolver to use TCP. OPTIONS
-p pidfile Write the process ID to pidfile. -c config Use config as configuration file. -t Test configuration file syntax. SEE ALSO
iptables(8), /etc/redsocks.conf AUTHOR
redsocks was written by Leonid Evdokimov <leon@darkk.net.ru> This manual page was written by Apollon Oikonomopoulos <apoikos@gmail.com>, for the Debian project (and may be used by others). November 14, 2011 REDSOCKS(8)
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