I have RedHat 8. I have turned the firewall off completely and iptables shows no rules at all.
But suddenly it seems as though I am firewalled, I noticed it a couple of days ago when trying to run gtk-gnutella. According to my isp, I am not firewalled at their end, and i can connect to the gnutella network using limewire in windows (shudder). So it appears as though its a problem with linux.
I can telnet to my machine ok on my local network, so it appears whatever is firewalling me is not causing a problem on my local home network, but i cannot be telnetted to from the Internet. I connect to the internet using kppp, and everything was working fine up until a couple of days ago, and I haven't played with a thing. I have tried everything and I am completely stumped, I want to be able to be connected to and I want to be able to use gnutella again on my linux box. Any ideas anyone has would be greatly appreciated.

Verify what rules you have in place and go from there:
iptables --list -n

yeah there's no rules there... policy accept on everything
i got it working again... i think its my isp...
trying to block me or something from connecting to the gnutella network

Make sure you have ip_forwarding enabled on the linux box.

cat /proc/sys/net/ipv4/ip_forward;

It should replay with 1 if not then
echo 1 > /proc/sys/net/ipv4/ip_forward;

You can update the /etc/sysctl.conf file with
net.ip_forward=1
to make it perminent.

yep no worries it all seems to be working now... using a port number above 10000 on gnutella seemed to fix it... i dunno why
thanks for all your help its been really helpful and you dudes replied really quick
i remember installing free bsd years ago on a 486... what a nightmare
linux has come a long way and the only time i even bother to load windows is to play games..
it sucks :P

skipjack_au
Remember!! it's all about PERMISSIONS never NEVER make big changes logged in as Root! you can BREAK files -permissions there!

If anyones still on this thread I could use some help.
Last month I decieded to do some year end clean up so I emptied my work dir and deleted my /.Gtk-Gnutella Dir figuring all I'd have to do is run Gtk-Gnutella again and point it to the corect Dirs and that'd do it. It now just sits there showing 0/3 connections. I've even uninstalled the 0.93 rpm and whyped everything I could find that said Gtk-Gnutella befor reinstalling, nothing! I don't know what I screwed up but it worked before. I tried turning off the router firewall, chainging ports, ipforwarding still nothing. I tried apolon but it can't giftd and after a week fighting it I gave up. Ideas welcome.
Alvin