CLion with WSL2, unable to establish a connection (but it was working yesterday).

I've been using CLion on WSL2 toolchain for a while now and suddenly it stopped working. I have no idea what has changed but it no longer establishes a connection. 

Yesterday I was able to use: username@localhost:22 with my password to connect to WSL from clion. Today the same settings give a `cannot establish connection` error. I've tried `sudo service restart` and it does nothing. When I open Ubuntu18.04 shell in windows (the one I've been using), these commands all work:

• ssh ciaran@localhost -p 22
• ssh ciaran@127.0.0.1 -p 22
• ssh ciaran@127.0.1.1

But the corresponding credentials in CLion still result in the `unable to establish connection error`

Looking at the top few lines of my sshd_Config file gives me this (though note I've been playing a bit with the port number. 

```

(base) ciaran@DESKTOP-K0APGUV:~$ head -n40 /etc/ssh/sshd_config
# $OpenBSD: sshd_config,v 1.101 2017/03/14 07:19:07 djm Exp $

# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override the
# default value.

#Port 2222
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key

# Ciphers and keying
#RekeyLimit default none

# Logging
#SyslogFacility AUTH
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin prohibit-password
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#PubkeyAuthentication yes

# Expect .ssh/authorized_keys2 to be disregarded by default in future.
#AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2

```