[WSL2] ssh into Ubuntu

 Windows 10   WSL2   Ubuntu  

▌Problem

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Cannot ssh into WSL2 Ubuntu and got the error:

$ ssh root@localhost -p 22

ssh_exchange_identification: Connection closed by remote host

▌Solution

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1. Reinstall SSH Server

$ sudo apt-get purge openssh-server

$ sudo apt-get install openssh-server

2. Update/Enable the values in /etc/ssh/sshd_config

First change the owner of sshd_config, (and change it back to root after everything is done)

$ sudo chown <current_user> /etc/ssh/sshd_config

Key	Value	Note
PermitRootLogin	yes	The value can be yes, prohibit-password, forced-commands-only, or no.
PasswordAuthentication	yes

You can also change the following values for ssh into it from remote machine,

Key	Sample Value	Note
ListneAddress	0.0.0.0
Port	2222	Notice that Windows 10/Server 201 had used port 22 for its own SSH server

3. Restart SSH-Server Service

$ sudo service ssh --full-restart

▌Reference

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▋How can I SSH into “Bash on Ubuntu on Windows 10”?

▋How to SSH into WSL