can't access FTPs

["Mark Feijo" <cheesie@accglobal.net>]

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Hello all,
 
I’m having trouble allowing internal computers to access remote FTP
sites on the net.   The new version of CUTE FTP can seem to connect ok.
But Internet Explorer gives an error “Invalid PORT command”.  And Bullet
Proof FTP says it can’t open the socket.
 
 
Also, one other question.  Below is a section from my script.  I wrote
most of my script from scratch but added this from another one that I
found.  I notice that it slows down my internet a little.  Any ideas
why?
 
# ICMP Control and Status Messages
 
# Log and drop initial ICMP fragments
iptables -A INPUT --fragment -p icmp -j LOG \
         --log-prefix "Fragmented incoming ICMP: "
iptables -A INPUT --fragment -p icmp -j DROP
 
iptables -A OUTPUT --fragment -p icmp -j LOG \
         --log-prefix "Fragmented outgoing ICMP: "
iptables -A OUTPUT --fragment -p icmp -j DROP
 
iptables -A FORWARD --fragment -p icmp -j LOG \
         --log-prefix "Fragmented forwarded ICMP: "
iptables -A FORWARD --fragment -p icmp -j DROP
 
iptables -A INPUT -p icmp \
         --icmp-type source-quench -d $NETIP -j ACCEPT
 
iptables -A OUTPUT -p icmp \
         --icmp-type source-quench -j ACCEPT
 
iptables -A FORWARD -p icmp \
         --icmp-type source-quench -j ACCEPT
 
iptables -A INPUT -p icmp \
         --icmp-type parameter-problem -j ACCEPT
 
iptables -A OUTPUT -p icmp \
         --icmp-type parameter-problem -j ACCEPT
 
iptables -A FORWARD -p icmp \
         --icmp-type parameter-problem -j ACCEPT
 
iptables -A INPUT -p icmp \
         --icmp-type destination-unreachable -j ACCEPT
 
iptables -A OUTPUT -p icmp \
         --icmp-type fragmentation-needed -j ACCEPT
 
iptables -A FORWARD -p icmp \
         --icmp-type fragmentation-needed -j ACCEPT
 
# Don¹t log dropped outgoing ICMP error messages
iptables -A OUTPUT  -p icmp \
         --icmp-type destination-unreachable -j DROP
 
iptables -A FORWARD -o $NETFACE -p icmp \
         --icmp-type destination-unreachable -j DROP
 
 
thanks for any help.
 
 
Mark.

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