On Wed, Jun 12, 2024 at 10:33 PM Greg Marks <gtma...@gmail.com> wrote: > > I'm running a Debian server from my home with a static IP address, > with ssh configured to use key-based authentication rather than > password-based. As of a couple weeks ago, I have been unable to ssh to > my server from external locations. When I ssh from a laptop connected > to the wireless network on the same router as my home server, I do > successfully connect to the server. But when I ssh from an external > location, I get this error: > > [...] > The problem began a couple weeks ago; previously (and for many years) > I had been able to ssh to my server without issue. The first time it > failed, I was using free wireless at an airport; I was able to ssh to my > server from the hotel that morning, and maybe, the first time I tried, > from the airport, but then subsequent ssh attempts from the airport > failed to connect. I mention this only because nothing had changed in > my server's configuration when this problem began. > > This is a real problem for me, as a lot of my work involves sending > files via scp between work and home. Any suggestions about how to > troubleshoot and hopefully fix the problem will be greatly appreciated.
In the past, I experienced similar breakages. In my case, my ISP (Verizon) provided router updates that blew away my router config. So I lost port forwarding to my internal servers. I personally don't make port 22 available at the router. Instead, I use port 1522 (first server), port 1523 (second server), etc. Then port 1522 is forwarded to the first server on port 22, port 1523 is forwarded to the second server on port 22, etc. Jeff
