Firebase tools and Dev Container: The web page (localhost:5000) never loaded

[RaheutRahwana]

• VSCode Version: 1.89.0 Linux x64 6.1.0-20-amd64 snap
• Local OS Version: Debian GNU/Linux 12
• Remote OS Version: Debian GNU/Linux 11
• Remote Extension/Connection Type: Containers

• Logs: https://pastebin.com/raw/ssmMV5YW

Steps to Reproduce:

Create a Firebase web project if you don't have one already.

1. Open VS Code and create a new folder.
2. Add a Node.js & JavaScript Dev Container configuration file.
3. Reopen the folder in the container.
4. Once everything is set up, run the command npm install -g firebase-tools.
5. Run the command firebase login and follow in browser.
6. Run the command firebase init and follow the prompts.
7. Run the command firebase serve.
8. Follow the URL provided, and you'll notice that the page does not load as expected.

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

[chrmarti]

Is firebase running on port 5000? The log shows ECONNREFUSED 127.0.0.1:5000.

What do you get when running netstat -l in the container?

[RaheutRahwana]

Is firebase running on port 5000? The log shows ECONNREFUSED 127.0.0.1:5000.

Yes, the Firebase Hosting running on port 5000.

What do you get when running netstat -l in the container?

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 localhost:44353         0.0.0.0:*               LISTEN     
Active UNIX domain sockets (only servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     385573   /home/node/.gnupg/S.gpg-agent
unix  2      [ ACC ]     STREAM     LISTENING     386790   /tmp/vscode-git-bf89df8c55.sock
unix  2      [ ACC ]     STREAM     LISTENING     387077   /tmp/vscode-ipc-ab9ed8a4-62f6-4732-9981-964b4aa436df.sock
unix  2      [ ACC ]     STREAM     LISTENING     383726   /tmp/vscode-remote-containers-ipc-b2bda113-e9ec-4c44-a0b1-899fecbcec1b.sock
unix  2      [ ACC ]     STREAM     LISTENING     385564   /tmp/vscode-ssh-auth-b2bda113-e9ec-4c44-a0b1-899fecbcec1b.sock
unix  2      [ ACC ]     STREAM     LISTENING     385565   /tmp/.X11-unix/X2
unix  2      [ ACC ]     STREAM     LISTENING     385921   /tmp/vscode-ipc-a269198b-db8a-4c76-ba81-9bb66a11879a.sock

The netstat -l result while the firebase serve is running:

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 localhost:44353         0.0.0.0:*               LISTEN     
tcp6       0      0 localhost:5000          [::]:*                  LISTEN     
Active UNIX domain sockets (only servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     385573   /home/node/.gnupg/S.gpg-agent
unix  2      [ ACC ]     STREAM     LISTENING     386790   /tmp/vscode-git-bf89df8c55.sock
unix  2      [ ACC ]     STREAM     LISTENING     387077   /tmp/vscode-ipc-ab9ed8a4-62f6-4732-9981-964b4aa436df.sock
unix  2      [ ACC ]     STREAM     LISTENING     383726   /tmp/vscode-remote-containers-ipc-b2bda113-e9ec-4c44-a0b1-899fecbcec1b.sock
unix  2      [ ACC ]     STREAM     LISTENING     385564   /tmp/vscode-ssh-auth-b2bda113-e9ec-4c44-a0b1-899fecbcec1b.sock
unix  2      [ ACC ]     STREAM     LISTENING     385565   /tmp/.X11-unix/X2
unix  2      [ ACC ]     STREAM     LISTENING     385921   /tmp/vscode-ipc-a269198b-db8a-4c76-ba81-9bb66a11879a.sock
unix  2      [ ACC ]     STREAM     LISTENING     533838   /tmp/vscode-ipc-00b036b2-dfe7-4923-b112-c4b4999102ce.sock

FYI.

the localhost:44353 page was loaded successfully and say Forbidden.

docker network inspect bridge
[
    {
        "Name": "bridge",
        "Id": "e52e11a8aa0190368961a8e1f4a87a9d7ab0666708b29972bbd74bd70b578acd",
        "Created": "2024-05-03T12:40:38.908444676+07:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.17.0.0/16",
                    "Gateway": "172.17.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "d80ebb6c45853203efd8f60855a98168a0026e1b8d34aa1ccfb43e6317486d45": {
                "Name": "elegant_payne",
                "EndpointID": "4300fc1021482b52f73e5499562af14a1807582c70728c2a29a717d1066fe4fd",
                "MacAddress": "02:42:ac:11:00:02",
                "IPv4Address": "172.17.0.2/16",
                "IPv6Address": ""
            }
        },
        "Options": {
            "com.docker.network.bridge.default_bridge": "true",
            "com.docker.network.bridge.enable_icc": "true",
            "com.docker.network.bridge.enable_ip_masquerade": "true",
            "com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
            "com.docker.network.bridge.name": "docker0",
            "com.docker.network.driver.mtu": "1500"
        },
        "Labels": {}
    }
]

[4llan]

Hello. I've had a similar issue related to yours, and the problem is related to the app listening to the IPv6 loopback inside a dev container: #7029 (comment)

Noticing that the output of your netstat -l says that the app is listening to the IPv6 loopback:

tcp6       0      0 localhost:5000          [::]:*

can you test the firebase serve --host 127.0.0.1 (IPv4 loopback) to see if the forwarding works?

[RaheutRahwana]

@4llan,
Thanks for the suggestion! I've tried running the Firebase serve command with the IPv4 loopback address (127.0.0.1 and 0.0.0.0), and I can confirm that the forwarding works as expected. So, it seems like using the IPv4 loopback resolved the issue. Appreciate your help!

[alexr00]

Closing as a duplicate of #7029