IPTables

As a nonprivileged user, your're unable to open a port below 1024 on all RedHat Servers.
Therefore a little workarround is required:

First, enable the helper-module:

vi /etc/sysconfig/iptables-config

and change the first settings and add " iptable_nat ip_nat " :

IPTABLES_MODULES="ip_conntrack_netbios_ns iptable_nat ip_nat"

Now you can add the new rules for the Firewall (iptables) :
For a better understanding, I added the whole /etc/sysconfig/iptables

# Generated by iptables-save v1.3.5 on Mon Jun 27 11:14:53 2011
*nat
:PREROUTING ACCEPT [12:1028]
:POSTROUTING ACCEPT [1:70]
:OUTPUT ACCEPT [1:70]
-A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
-A PREROUTING -d 172.31.20.53 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
-A OUTPUT -d 127.0.0.1 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
-A OUTPUT -d 172.31.20.53 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
-A PREROUTING -i eth0 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 8443
-A PREROUTING -d 172.31.20.53 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 8443
-A OUTPUT -d 127.0.0.1 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 8443
-A OUTPUT -d 172.31.20.53 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 8443
COMMIT
# Completed on Mon Jun 27 11:14:53 2011
# Generated by iptables-save v1.3.5 on Mon Jun 27 11:14:53 2011
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [408:56497]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p esp -j ACCEPT
-A RH-Firewall-1-INPUT -p ah -j ACCEPT
-A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 16163 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 161 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m state --state NEW -m udp --dport 161 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 8443 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT