Networking and servers • Pi stops working with SSH connection (headless)

I have a Raspberry Pi 4 Module B that I cannot connect to via SSH connection from my laptop.

The error I see after SSH (through Windows cmd) is that it says:

It has been working before. One thing that changed was that I started using a new computer, but I still wasn't able to connect to the previous laptop I used to SSH to. I haven't SSH to it recently for about a week.

The MicroSD Card was my first guest; I bought a new one and flashed Raspberry Pi OS 32-bit (which it had before also) to it, but it still didn't work. I backed up important files from the old MicroSD Card and made a full copy of it as well, though.

I have no idea if the Pi isn't able to connect to the internet, or if I can see if it is; I just don't know how to do that. I don't have an Ethernet cable, so I can't check that way.

I also have a keyboard and mouse, but I don't have a monitor. I don't think there are any issues with the Pi itself since I was working with GPIO pins, wifi conection, etc.

I hope that I included all necessary details. Thank you for your help in advance.

Statistics: Posted by Mat1020 — Fri Feb 27, 2026 4:36 am

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