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ssh tunnelling testing

I'm running Debian/Buster on various servers, including my home server. I'm trying to set up an ssh tunnel that I can use post-pandemic in case I need to access my home network remotely. I'm already doing this to various remote servers so I thought this should just work, since I can already access my home server locally using its 192.168... address (actually through the /etc/hosts file using the server's name).

I've set up port forwarding on both my routers (I have an inner network and an outer one, using the outer network for devices I don't really control). I can access my Apache2 server on the inner network by forwarding port 80 on the outer network to the WAN address of the inner router and forwarding that to my server. Pointing my browser to the external IP address of the outer router brings up the default page - which I can change so I know it's the actual local page.

However, when I try to ssh to the same address, it just times out.

I've compared the sshd.conf file on my local server to one on a remote server and they are identical. The only uncommented lines are:

PasswordAuthentication no
ChallengeResponseAuthentication no
UsePAM yes
X11Forwarding yes
PrintMotd no
AcceptEnv LANG LC_*
Subsystem       sftp    /usr/lib/openssh/sftp-server

Any ideas on what's going wrong?

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