Firebase serve error: Port 5000 is not open. Could not start functions emulator

Question

I'm trying to serve firebase functions locally, but when I run firebase serve or firebase emulators:start the error message is: "Port 5000 is not open, could not start functions emulator."

I'm using Windows 10, so I've tried to change the port number, check if the port is blocked by Firewall and I create a new rule in Firewall to ports 5000-5010 but none of this approaches worked for me.

Solution 1

For Mac/Linux, use the Terminal/Shell to find the Process ID (PID), then kill the process.

sudo lsof -i :5000
sudo kill -9 PID

Solution 2

In MacOS Monterey, port 5000 may be claimed by a new "AirPlay Receiver". This can be disabled in Settings -> Sharing:

Screenshot of settings panel for disabling AirPlay Receiver

Disabling the AirPlay Receiver (if you do not need it) frees up port 5000.

Solution 3

For Windows Users:

netstat -ano|findstr "PID :5000"

And then with the Process ID (PID) found at the end of the line.

taskkill /pid FOUNDPID /F

Command taskkill does not work from within terminal of VS Code context. It needs an (elevated) CMD-prompt or equivalent Powershell environment in order to successfully terminate the listening on 127.0.0.1:5000.

Solution 4

Alternatively use a different port, it is a simple solution. For example, firebase serve -p 5001

Solution 5

The thing here is your port No 5000 is running with some process. So, first, you need to kill that process.

To find the Process id in ubuntu

sudo lsof -i :5000

Suppose PID you get 14541

To kill the Process

sudo kill -9 14541

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