"docker.host": "ssh://user@ip" hangs the remote machine

[zingdle]

• VSCode Version: 1.48.0
• Local OS Version: Ubuntu 20.04
• Remote OS Version: Ubuntu 20.04
• Remote Extension/Connection Type: Docker

Steps to Reproduce:

Before started, I can ssh to the remote host.

When using vscode remote to connect a remote docker host with .vscode/settings.json:

{
  "docker.host": "ssh://user@ip"
}

Open the folder in container, It hangs on:

...
[2954 ms] Forwarding local port 41933 to container port 41933
[3000 ms] Start: Run: docker exec -i -u vscode -e VSCODE_REMOTE_CONTAINERS_SESSION=dc12973c-4ddf-4775-ad24-ff305839870e1599053809993 95809220cb717e4c26ed285f71047124102477b94d6ac6c6bbf335299c71b969 /home/vscode/.vscode-server/bin/db40434f562994116e5b21c24015a2e40b2504e6/node -e 
[3005 ms] Start: Run: docker exec -i -u vscode -e VSCODE_REMOTE_CONTAINERS_SESSION=dc12973c-4ddf-4775-ad24-ff305839870e1599053809993 95809220cb717e4c26ed285f71047124102477b94d6ac6c6bbf335299c71b969 /home/vscode/.vscode-server/bin/db40434f562994116e5b21c24015a2e40b2504e6/node -e 

At this time I tried to ssh the remote machine, it hangs too:

ssh -vvv user@ip
...
debug2: ssh_connect_direct
debug1: Connecting to ip [ip] port 22.

But few minutes later, I can ssh to the remote host again.

Using tcp://localhost:23750 instead works fine for me.

[zingdle]

I believe this issue is mostly related to container, not ssh.

@chrisdias

[bamurtaugh]

cc @chrmarti

[chrmarti]

@zingdle Can you try monitoring the remote host while connecting to it with Remote-Containers? E.g., using top to monitior CPU and memory usage in a separate ssh session (or without ssh if you have physical access to the machine). That would help us understand what is going on.

[github-actions[bot]]

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Happy Coding!