Can't connect to FTP server from another host

[daghastly1]

Hello,
I'm having a problem connecting to my built-in FTP server. I can connect to it from the macbook pro it is running on by using my IP address or my loopback address. however when I try to connect to it from another host (on the same subnet as my MBP) I can't. My MBP just doesn't respond to the connection attempts. I ran wireshark on my MBP and it shows that it doesn't respond. I can see the SYN packets coming in but no SYN/ACK packets are sent back.

I am running 10.5.2 (leopard) which is an upgrade from Tiger, not a fresh install.

Thank you for your time.

 

[daghastly1]

I forgot to mention. This happens if I set my built-in firewall to allow all incoming connections or if I set it to set access for specific services and applications.

Thanks again.

 

[daghastly1]

Also, the same thing is happening to my SSH and TFTP server. It's like there is another firewall overriding the OSX firewall.

 

[Satcomer]

If you are running a NAT router this might be blocking the return packets. Did you check Apple's document "Well Known" TCP and UDP ports used by Apple software products?

 

[daghastly1]

There is no NAT happening on my PCs. I ran wireshark and I can see the IPs/Ports coming in and out. The PC I'm trying to connect to my MBP from is on the same subnet as my MBP and there is nothing inbetween them.

 

[daghastly1]

It was my checkpoint VPN client. I thought I had the version that didn't have the firewall (securemote) but I have the version that does (secureclient).