Re: Port forwarding with Putty - I'm stuck

all mail refused wrote:
On 2007-06-28, Dave <someplace@xxxxxxxxxxxxxxxx> wrote:

then if I ssh to my UNIX box whilst on my home network, and set the mail server in Thunderbird on my laptop to be localhost on port 30110, I am able to send mail OK. But when I am at a remote location, this does not work, despite me changing the 192.168.0.10 to the public IP address.

I notice "port 30110, I am able to send mail OK" but is POP3 involved
in your *sending* of mail?

I basically chose ports for services which were 30000 above normal values - hence pop3 is used at port

Does the NAT allow your SSH traffic inbound from your remote location
to he unix box?

Yes, I can ssh to the box from a remote location. i.e. the router routes port 22 to the IP address of my Sun workstation (192.168.0.10). Not I have not routed any other ports to the Sun - only 22.

I expect you can improve on the description "does not work" by stating what
does happen.



The mail or newsgroup clients appear try to connect to the server and do not give a connection refused message. This makes me think they are connecting to a server of some sort, since if I try another port, where I have made no attempt to forward ports, the mail client will report the connection is refused.

I can't exactly recall what the settings were, but I did try to ssh to port 30110 of the laptop using an ssh client on the laptop, and I can log into the Sun workstation via that. (This is not what I want of course). This is suggesting that the mail client is probably connecting to an ssh server and since they are not designed for that protocol it can't do anything useful.

I really don't know what should be entered into Putty - 3 semi-sensible possibilities include:

1) Public IP of my Sun
2) NAT'ed IP of my Sun
3) Public IP of my ISP's mail server.

.

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