remote-ssh couldn't establish connection to the remote via proxy, while openSSH and putty could

[Euruson]

• VSCode Version: 1.51.0
• Local OS Version: Windows_NT x64 10.0.18363
• Remote OS Version: Ubuntu 18.04 LTS
• Remote Extension/Connection Type: SSH

Steps to Reproduce:

1. Have a server behind a firewall. The server is connected to the Internet, but cannot be directly reached from local.
2. Build a proxy like a tunel between remote and local. For me, I use v2ray's "reverse" proxy, which redirects traffic from local to remote.
3. Use remote-ssh via this proxy.

Here is my ssh config:

Host trainer
    HostName localhost
    ProxyCommand connect -S 127.0.0.1:1080 %h %p
    IdentityFile ~/.ssh/id_rsa
    User euruson

I can ssh to the remote with openSSH client using this config file, as well as with putty. But with VScode's Remote-SSH, the connection cannot be established.

Remote-SSH works perfectly with the server in LAN.

And here is the log in VScode's console:

[18:30:24.913] Log Level: 2
[18:30:24.915] remote-ssh@0.55.0
[18:30:24.915] win32 x64
[18:30:24.916] SSH Resolver called for "ssh-remote+trainer", attempt 1
[18:30:24.916] SSH Resolver called for host: trainer
[18:30:24.916] Setting up SSH remote "trainer"
[18:30:24.935] Using commit id "fcac248b077b55bae4ba5bab613fd6e9156c2f0c" and quality "stable" for server
[18:30:24.937] Install and start server if needed
[18:30:24.940] Checking ssh with "ssh -V"
[18:30:24.979] > OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5

[18:30:24.982] Running script with connection command: ssh -T -D 4632 trainer bash
[18:30:24.985] Terminal shell path: C:\WINDOWS\System32\cmd.exe
[18:30:25.038] > 
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[18:30:25.038] Got some output, clearing connection timeout
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[18:30:25.069] > CreateProcessW failed error:2
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[18:30:25.079] > posix_spawn: No such file or directory
> 过程试图写入的管道不存在。
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[18:30:25.353] "install" terminal command done
[18:30:25.354] Install terminal quit with output: 过程试图写入的管道不存在。
[18:30:25.354] Received install output: 过程试图写入的管道不存在。
[18:30:25.354] Stopped parsing output early. Remaining text: 过程试图写入的管道不存在。
[18:30:25.355] Failed to parse remote port from server output
[18:30:25.361] Resolver error: Error: 
	at Function.Create (c:\Users\yulin\.vscode\extensions\ms-vscode-remote.remote-ssh-0.55.0\out\extension.js:1:130564)
	at Object.t.handleInstallOutput (c:\Users\yulin\.vscode\extensions\ms-vscode-remote.remote-ssh-0.55.0\out\extension.js:1:127671)
	at I (c:\Users\yulin\.vscode\extensions\ms-vscode-remote.remote-ssh-0.55.0\out\extension.js:127:106775)
	at processTicksAndRejections (internal/process/task_queues.js:94:5)
	at async c:\Users\yulin\.vscode\extensions\ms-vscode-remote.remote-ssh-0.55.0\out\extension.js:127:104774
	at async Object.t.withShowDetailsEvent (c:\Users\yulin\.vscode\extensions\ms-vscode-remote.remote-ssh-0.55.0\out\extension.js:127:109845)
	at async Object.t.resolve (c:\Users\yulin\.vscode\extensions\ms-vscode-remote.remote-ssh-0.55.0\out\extension.js:127:107960)
	at async c:\Users\yulin\.vscode\extensions\ms-vscode-remote.remote-ssh-0.55.0\out\extension.js:127:141955
[18:30:25.364] ------

Does this issue occur when you try this locally?: No
Does this issue occur when you try this locally and all extensions are disabled?: No

[roblourens]

[18:30:25.069] > CreateProcessW failed error:2
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[18:30:25.079] > posix_spawn: No such file or directory

I have no clue. Does something like this work? echo "echo hello" | ssh -T <yourhost> bash?

[Euruson]

[18:30:25.069] > CreateProcessW failed error:2
> 
[18:30:25.079] > posix_spawn: No such file or directory

I have no clue. Does something like this work? echo "echo hello" | ssh -T <yourhost> bash?

In win10's cmd, I got this:

C:\Users\Euruson>where ssh
C:\Windows\System32\OpenSSH\ssh.exe

C:\Users\Euruson>echo "echo hello" | ssh -T euruson@trainer bash
CreateProcessW failed error:2
posix_spawn: No such file or directory

In git-bash, I got this:

Euruson@DESKTOP-4RLUREV MINGW64 ~
$ echo "echo hello" | ssh -T euruson@trainer bash
hello

[Euruson]

Following this, I found it works by setting connect in ssh_config's ProxyCommand to absolute path.

So this problem may be resulted from environment variables. But it's really confusing that the same config with relative path works fine for git, like this:

Host github.com *.github.com
    ProxyCommand connect -S 127.0.0.1:1080 %h %p
    IdentityFile ~/.ssh/id_rsa
    User git

Anyway, thanks for pointing out the key information.

[roblourens]

Strange. Glad you were able to work it out.