I have openssh-server-3.5p1-7mdk.i586.rpm installed. This also came pre installed on my mandrake 9.1 box. I can ssh into my linux box from anywhere on my lan using putty. I can not ssh into my linux box from the Internet side of my d-link DI-604 router. I have a virtual server on the router listening on port 22 and forwarding it to my linux box using tcp/ip on port 22. The routers firewall is configured to allow this. As for the firewall on the linux box, I'm very sure it's disabled. As I am new to linux, this could be wrong. I'm wondering now if because the ip the client is connecting to and the ip of the ssh server host are different, if this messes up the encryption of ssh.


Also I tried putting my linux box in the dmz with no success.

my initial guess is that you have a problem with your router config. If you can connect to your linux box on your lan, your router is connected to that lan, but you still can't connect from the internet, then my guess is port forwarding on the router is not working.

You could run a firewall test on your router to see if port 22 is open. Then do a tcpdump from your linux box. If port 22 is not open or you aren't getting anything from your router's ip on port 22 then your problem lies with the router.

It didn't take me this long to fix my problem, I just got around to it. My first try was to update the firmware on the router and it worked. SSH is now working fine. Thanks for your help mrtwice.

you are welcome

I don't mean to insult your intelligence, but are you using the public or private ip address on the lan to connect to the computer on the lan? Any IP addy that starts with 10. or 192. is a private IP addy. Private meaning that it is non-routable and any router will discard packets destined to those addresses. Make sure that you have a private and a public ip address or that your router will perform NAT. use google, you will find what you need.