IPTABLES: Forwarding port to different machine & different port

I'm a little lost... I want to simplify the server setup and get rid of
some forwarding rules in xinetd. So I've modified the firewall rules
like this:

<---header snipped (sets up basic rules and preps)--->
# Enable NAT
/usr/sbin/iptables -t nat -A POSTROUTING -o eth1 -j SNAT --to-source
207.224.222.229
#/usr/sbin/iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

# Port redirect
# VNC Listeners for tech support
/usr/sbin/iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 5500 -j
DNAT --to-destination 10.0.0.109:5500
/usr/sbin/iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 5501 -j
DNAT --to-destination 10.0.0.113:5500
# VNC Forwards for some office people
/usr/sbin/iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 5900 -j
DNAT --to-destination 10.0.0.105:5900
/usr/sbin/iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 59105 -j
DNAT --to-destination 10.0.0.105:5900
/usr/sbin/iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 59106 -j
DNAT --to-destination 10.0.0.106:5900
/usr/sbin/iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 59107 -j
DNAT --to-destination 10.0.0.107:5900
/usr/sbin/iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 59108 -j
DNAT --to-destination 10.0.0.108:5900
<---everything below snipped because it's only firewall rules--->

Funny thing: the first two (VNC listeners) work. Everything below does
not. Any idea what's wrong there?

Thanks a lot
J
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