I was trying to set up a new homelab server the other day, and I stumbled upon this frustrating issue. At first, I thought it was a firewall problem, but after checking the rules, I realized that wasn't the case. After some digging, I discovered that the issue was due to the SSH service not being enabled on the server. But here's the thing: I had enabled the service, but I hadn't restarted it after making some configuration changes. The command 'sudo systemctl restart sshd' saved the day. It got me thinking, though - what other services might be in a similar state? I started checking the status of other services, and sure enough, I found a few that needed a restart. Moral of the story: always double-check the service status after making changes, and don't be afraid to restart when necessary.