[Question] Coder v2 OSS behind Cloudflare #9130

YueMiyuki · 2023-08-16T11:36:29Z

YueMiyuki
Aug 16, 2023

Hi. I have recently deployed Coder v2 OSS on my server and I use cloudflare tunnels to provide secure access to the server.
The question is that if I try to open a worksapce in VS Code Desktop, it fails to load the workspace.
Here is VSC OUTPUT tab:

[19:35:28.450] Log Level: 2
[19:35:28.463] VS Code version: 1.81.1
[19:35:28.463] Remote-SSH version: remote-ssh@0.102.0
[19:35:28.464] win32 x64
[19:35:34.363] SSH Resolver called for "ssh-remote+coder-vscode--yue--main", attempt 1
[19:35:34.364] "remote.SSH.useLocalServer": false
[19:35:34.365] "remote.SSH.showLoginTerminal": false
[19:35:34.365] "remote.SSH.remotePlatform": {}
[19:35:34.366] "remote.SSH.path": undefined
[19:35:34.366] "remote.SSH.configFile": undefined
[19:35:34.366] "remote.SSH.useFlock": true
[19:35:34.367] "remote.SSH.lockfilesInTmp": false
[19:35:34.367] "remote.SSH.localServerDownload": auto
[19:35:34.367] "remote.SSH.remoteServerListenOnSocket": false
[19:35:34.367] "remote.SSH.showLoginTerminal": false
[19:35:34.368] "remote.SSH.defaultExtensions": []
[19:35:34.368] "remote.SSH.loglevel": 2
[19:35:34.368] "remote.SSH.enableDynamicForwarding": true
[19:35:34.369] "remote.SSH.enableRemoteCommand": false
[19:35:34.369] "remote.SSH.serverPickPortsFromRange": {}
[19:35:34.369] "remote.SSH.serverInstallPath": {}
[19:35:34.399] SSH Resolver called for host: coder-vscode--yue--main
[19:35:34.399] Setting up SSH remote "coder-vscode--yue--main"
[19:35:34.403] Using commit id "6c3e3dba23e8fadc360aed75ce363ba185c49794" and quality "stable" for server
[19:35:34.408] Install and start server if needed
[19:35:35.522] Checking ssh with "C:\Program Files\ImageMagick-7.1.1-Q16-HDRI\ssh.exe -V"
[19:35:35.526] Got error from ssh: spawn C:\Program Files\ImageMagick-7.1.1-Q16-HDRI\ssh.exe ENOENT
[19:35:35.526] Checking ssh with "C:\Program Files\Eclipse Adoptium\jdk-17.0.6.10-hotspot\bin\ssh.exe -V"
[19:35:35.527] Got error from ssh: spawn C:\Program Files\Eclipse Adoptium\jdk-17.0.6.10-hotspot\bin\ssh.exe ENOENT
[19:35:35.527] Checking ssh with "C:\Program Files (x86)\Intel\iCLS Client\ssh.exe -V"
[19:35:35.529] Got error from ssh: spawn C:\Program Files (x86)\Intel\iCLS Client\ssh.exe ENOENT
[19:35:35.529] Checking ssh with "C:\Program Files\Intel\iCLS Client\ssh.exe -V"
[19:35:35.530] Got error from ssh: spawn C:\Program Files\Intel\iCLS Client\ssh.exe ENOENT
[19:35:35.530] Checking ssh with "C:\Windows\system32\ssh.exe -V"
[19:35:35.532] Got error from ssh: spawn C:\Windows\system32\ssh.exe ENOENT
[19:35:35.532] Checking ssh with "C:\Windows\ssh.exe -V"
[19:35:35.534] Got error from ssh: spawn C:\Windows\ssh.exe ENOENT
[19:35:35.534] Checking ssh with "C:\Windows\System32\Wbem\ssh.exe -V"
[19:35:35.535] Got error from ssh: spawn C:\Windows\System32\Wbem\ssh.exe ENOENT
[19:35:35.536] Checking ssh with "C:\Windows\System32\WindowsPowerShell\v1.0\ssh.exe -V"
[19:35:35.537] Got error from ssh: spawn C:\Windows\System32\WindowsPowerShell\v1.0\ssh.exe ENOENT
[19:35:35.537] Checking ssh with "C:\Program Files\Intel\WiFi\bin\ssh.exe -V"
[19:35:35.539] Got error from ssh: spawn C:\Program Files\Intel\WiFi\bin\ssh.exe ENOENT
[19:35:35.539] Checking ssh with "C:\Program Files\Common Files\Intel\WirelessCommon\ssh.exe -V"
[19:35:35.541] Got error from ssh: spawn C:\Program Files\Common Files\Intel\WirelessCommon\ssh.exe ENOENT
[19:35:35.541] Checking ssh with "C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL\ssh.exe -V"
[19:35:35.542] Got error from ssh: spawn C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL\ssh.exe ENOENT
[19:35:35.542] Checking ssh with "C:\Program Files\Intel\Intel(R) Management Engine Components\DAL\ssh.exe -V"
[19:35:35.543] Got error from ssh: spawn C:\Program Files\Intel\Intel(R) Management Engine Components\DAL\ssh.exe ENOENT
[19:35:35.544] Checking ssh with "C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT\ssh.exe -V"
[19:35:35.545] Got error from ssh: spawn C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT\ssh.exe ENOENT
[19:35:35.545] Checking ssh with "C:\Program Files\Intel\Intel(R) Management Engine Components\IPT\ssh.exe -V"
[19:35:35.547] Got error from ssh: spawn C:\Program Files\Intel\Intel(R) Management Engine Components\IPT\ssh.exe ENOENT
[19:35:35.547] Checking ssh with "C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common\ssh.exe -V"
[19:35:35.548] Got error from ssh: spawn C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common\ssh.exe ENOENT
[19:35:35.549] Checking ssh with "C:\WINDOWS\system32\ssh.exe -V"
[19:35:35.550] Got error from ssh: spawn C:\WINDOWS\system32\ssh.exe ENOENT
[19:3
8000
5:35.551] Checking ssh with "C:\WINDOWS\ssh.exe -V"
[19:35:35.552] Got error from ssh: spawn C:\WINDOWS\ssh.exe ENOENT
[19:35:35.552] Checking ssh with "C:\WINDOWS\System32\Wbem\ssh.exe -V"
[19:35:35.554] Got error from ssh: spawn C:\WINDOWS\System32\Wbem\ssh.exe ENOENT
[19:35:35.554] Checking ssh with "C:\WINDOWS\System32\WindowsPowerShell\v1.0\ssh.exe -V"
[19:35:35.555] Got error from ssh: spawn C:\WINDOWS\System32\WindowsPowerShell\v1.0\ssh.exe ENOENT
[19:35:35.555] Checking ssh with "C:\WINDOWS\System32\OpenSSH\ssh.exe -V"
[19:35:35.607] > OpenSSH_for_Windows_9.2p1, LibreSSL 3.6.2

[19:35:35.611] Running script with connection command: "C:\WINDOWS\System32\OpenSSH\ssh.exe" -T -D 51128 "coder-vscode--yue--main" bash
[19:35:35.615] Terminal shell path: C:\WINDOWS\System32\cmd.exe
[19:35:37.175] > ssh: Could not resolve hostname coder-vscode--yue--main: \237o\267\250\327R\204e\337@\314\250\326\367\231C\241\243
> The process tried to write to a nonexistent pipe.
> �]0;C:\WINDOWS\System32\cmd.exe�
[19:35:37.176] Got some output, clearing connection timeout
[19:35:38.459] "install" terminal command done
[19:35:38.459] Install terminal quit with output: �]0;C:\WINDOWS\System32\cmd.exe�
[19:35:38.460] Received install output: �]0;C:\WINDOWS\System32\cmd.exe�
[19:35:38.461] Failed to parse remote port from server output
[19:35:38.464] Resolver error: Error: 
	at m.Create (c:\Users\YueYue\.vscode\extensions\ms-vscode-remote.remote-ssh-0.102.0\out\extension.js:1:584145)
	at t.handleInstallOutput (c:\Users\YueYue\.vscode\extensions\ms-vscode-remote.remote-ssh-0.102.0\out\extension.js:1:582705)
	at t.tryInstall (c:\Users\YueYue\.vscode\extensions\ms-vscode-remote.remote-ssh-0.102.0\out\extension.js:1:681881)
	at async c:\Users\YueYue\.vscode\extensions\ms-vscode-remote.remote-ssh-0.102.0\out\extension.js:1:644110
	at async t.withShowDetailsEvent (c:\Users\YueYue\.vscode\extensions\ms-vscode-remote.remote-ssh-0.102.0\out\extension.js:1:647428)
	at async t.resolve (c:\Users\YueYue\.vscode\extensions\ms-vscode-remote.remote-ssh-0.102.0\out\extension.js:1:645160)
	at async c:\Users\YueYue\.vscode\extensions\ms-vscode-remote.remote-ssh-0.102.0\out\extension.js:1:720916
[19:35:38.474] ------

matifali · 2023-08-16T21:53:21Z

matifali
Aug 16, 2023
Maintainer

This might be related to your question.
https://discord.com/channels/747933592273027093/1059038889878241310

10 replies

phorcys420 Sep 9, 2024
Collaborator

to use CloudFlare Tunnels with the CLI on the client, you will probably need to do something like this:

export TOKEN=$(cloudflared access token -app=http://coder.example.com)
coder 
export CODER_HEADER=cf-access-token=$TOKEN
coder login https://coder.example.com

or

export TOKEN=$(cloudflared access token -app=http://coder.example.com)
coder 
coder login https://coder.example.com --header cf-access-token=$TOKEN

(https://developers.cloudflare.com/cloudflare-one/tutorials/cli/#using-the-token-as-an-environment-variable)

phorcys420 Sep 9, 2024
Collaborator

support for --header was added in #3527
on a side note, since quite a bit of people are using CF Access -- it could be worthy to add a section to our docs. (cc: @matifali, thoughts?)

matifali Sep 10, 2024
Maintainer

Yes. I would personally opt for a guide on how to host Coder behind a cloud flare tunnel.

alphamichael Sep 10, 2024

Thank you so much @phorcys420 and @matifali!! I really appreciate it!

Also, I tried the original discord link again and this time it loaded - I think I hadn't completed onboarding in Discord so it look like the messages were no longer available.

YueMiyuki Sep 18, 2024
Author

Hi- Sorry for the late reply.
I gave up coder behind cloudflare tunnel years ago and switched to cloudflare dns + nginx. It's happy to see that code sever is now supporting cloudflare tunnel. I will definitely try that out later :)

chrisbalmer · 2024-12-17T15:44:50Z

chrisbalmer
Dec 17, 2024

Once running the commands @phorcys420 listed, I also needed to run:

coder config-ssh

To get the cloudflared token added to the SSH config. Then I needed to connect to a remote via VSCode and specify the SSH path in the SSH config for the workspace (ssh coder.workspace-name.main). I am unable to use the VSCode button on the workspace or open a previous project in VSCode to connect when I am offsite.

Not an issue really since I can use the SSH path and remote connections, just something to note for future people looking to connect via this method.

1 reply

matifali Dec 18, 2024
Maintainer

When you connect via the VSCode button it uses the coder-remote extension that writes it own ssh-config.

To set a header for the extension you need to set it in the extension settings in VSCode.

neilmcguigan · 2025-08-31T22:39:07Z

neilmcguigan
Aug 31, 2025

you need to enable websockets on cloudflare, and either disable bot fight mode, or add a custom rule to prevent the cloudflare anti-bot measures from stopping coder

0 replies

[Question] Coder v2 OSS behind Cloudflare #9130

Uh oh!

YueMiyuki Aug 16, 2023

Replies: 3 comments · 11 replies

Uh oh!

matifali Aug 16, 2023 Maintainer

Uh oh!

phorcys420 Sep 9, 2024 Collaborator

Uh oh!

Uh oh!

phorcys420 Sep 9, 2024 Collaborator

Uh oh!

matifali Sep 10, 2024 Maintainer

Uh oh!

alphamichael Sep 10, 2024

Uh oh!

YueMiyuki Sep 18, 2024 Author

Uh oh!

chrisbalmer Dec 17, 2024

Uh oh!

matifali Dec 18, 2024 Maintainer

Uh oh!

neilmcguigan Aug 31, 2025

YueMiyuki
Aug 16, 2023

Replies: 3 comments 11 replies

matifali
Aug 16, 2023
Maintainer

phorcys420 Sep 9, 2024
Collaborator

phorcys420 Sep 9, 2024
Collaborator

matifali Sep 10, 2024
Maintainer

YueMiyuki Sep 18, 2024
Author

chrisbalmer
Dec 17, 2024

matifali Dec 18, 2024
Maintainer

neilmcguigan
Aug 31, 2025