Can't connect remotely using Remote-SSH: "spawn UNKNOWN" - visual-studio-code

Question

I'm trying to remotely connect to a server (running on Ubuntu 16.04.7 LTS) through VSCode (started on WSL).
I've set the path to my WSL Config file (with the SSH keys inside) in VSCode Remote-SSH.
I can reach and connect to the server through the terminal as well as the VSCode terminal.
Yet, when trying to connect through Remote-SSH I'm getting the message
Failed to connect to the remote extension host server (Error: spawn UNKNOWN)
with the following error log:
[13:50:42.906] Log Level: 2
[13:50:42.922] remote-ssh#0.56.0
[13:50:42.922] win32 x64
[13:50:42.925] SSH Resolver called for "ssh-remote+<net>.net", attempt 1
[13:50:42.925] SSH Resolver called for host: <net>.net
[13:50:42.926] Setting up SSH remote "<net>.net"
[13:50:42.970] Using commit id "<CommitID>" and quality "stable" for server
[13:50:42.974] Install and start server if needed
[13:50:44.876] Checking ssh with "ssh -V"
[13:50:44.888] Finding installed ssh failed: spawn UNKNOWN
[13:50:44.897] Resolver error: Error: spawn UNKNOWN
at ChildProcess.spawn (internal/child_process.js:394:11)
at Object.spawn (child_process.js:549:9)
at c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:1:242426
at new Promise (<anonymous>)
at q (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:1:242347)
at k (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:1:242298)
at _ (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:1:245580)
at P (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:1:245741)
at O (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:1:242117)
at C (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:1:242026)
at Object.t.generateMultiLineCommand (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:1:243396)
at q (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:127:107623)
at c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:127:105016
at processTicksAndRejections (internal/process/task_queues.js:94:5)
at async Object.t.withShowDetailsEvent (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:127:110096)
at async Object.t.resolve (c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:127:108158)
at async c:\Users\<user>\.vscode\extensions\ms-vscode-remote.remote-ssh-0.56.0\out\extension.js:127:143767
[13:50:44.908] ------
Already tried setting up manually the vscode server remotely as suggested here
Thanks in advance for any help!

Answer 1

Seems things got messed up with the update.
I fixed it by reinstalling the Remote SSH extension: ms-vscode-remote.remote-ssh and reloading as you will be instructed to do.
I also just installed the entire Remote Development extension: ms-vscode-remote.vscode-remote-extensionpack and reloaded vscode as instructed by vscode.
Before this though, I deleted (rm -rf) the contents of /home/<your_username>/.vscode-server/ bin/ and data/

Answer 2

Had the same problem.
After trying everything, the only thing that worked 100% was just killing vs-code and opening it again.