how to fix a ssh port 22 connection problem in windows 11

Question

Hello,
I have a reMarkable 2 e-ink tablet, and until recently it was no problem to place a for me important eraser-hack for my Lamy-pen via ssh there.

Now.

The ssh port 22 is closed - "connection timed out" - via the windows 11 computer terminal.
Also there is no connection possible via the "termius" ssh client of an Android-tablet.

So I assume that the problem is in the network or in my personal reMarkable as the reMarkable still works with other users after the latest updates - whereas, I made a factory setup of the reMarkable and it still doesn't work...

How can I open the ssh port 22 of the reMarkable?

Answer 1

Sorry about your family.

Sounds like you have a reMarkable configuration problem.

First enter this command. It will test your Windows firewall to verify that it allows outbound ssh traffic.

ssh ******@test.rebex.net

You should get a response like this below. If you can't connect then you likely have a firewall problem.

C:\>ssh ******@test.rebex.net
The authenticity of host 'test.rebex.net (194.108.117.16)' can't be established.
ED25519 key fingerprint is SHA256:d7Te2DHmvBNSWJNBWik2KbDTjmWtYHe2bvXTMM9lVg4.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])?

For network troubleshooting, I use a tool named Fing that I have installed on my Android phone. See https://www.fing.com/ They also have a Windows desktop version that you can try. When I connect my phone to my Wi-FI, Fing can see all devices on the network. My phones, my laptops, my TV boxes. It also reports on manufacturer.

Try either the phone or desktop version, and see if it discovers your reMarkable device. Then when you select the device in the "Manage this device" section, there is an option for "Find open ports". If it doesn't report that port 22 is open, then you need to ask this question in a reMarkable support forum and have them guide you in configuring that device to enable SSH.

Answer 2

Run this (as administrator):

Get-WindowsCapability -Online | Where-Object Name -like 'OpenSSH*'

Are both SSH client and server installed? Or does it look like this:

Name  : OpenSSH.Client~~~~0.0.1.0
State : Installed
Name  : OpenSSH.Server~~~~0.0.1.0
State : NotPresent

If the SSH server isn't installed, add it:

Add-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0