ng serve error localhost could NOT be bound

Please provide us with the following information:

OS?

Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?) Mac OSX El Capitan

Versions.

Please run ng --version. If there’s nothing outputted, please run in a Terminal: node --version and paste the result here:

angular-cli: 1.0.0-beta.16 node: 4.6.0 os: darwin x64

Repro steps.

Was this an app that wasn’t created using the CLI? What change did you do on your code? etc. A lot of changes but the backend guy can work with cli and use ng serve

The log given by the failure.

Normally this include a stack trace and some more information.

ng serve

Provided host localhost could NOT be bound. Please provide a different host address or hostname Error: Provided host localhost could NOT be bound. Please provide a different host address or hostname at Error (native) at /usr/local/lib/node_modules/angular-cli/node_modules/portfinder/lib/portfinder.js:139:27 at /usr/local/lib/node_modules/angular-cli/node_modules/portfinder/node_modules/async/lib/async.js:52:16 at /usr/local/lib/node_modules/angular-cli/node_modules/portfinder/node_modules/async/lib/async.js:264:21 at /usr/local/lib/node_modules/angular-cli/node_modules/portfinder/node_modules/async/lib/async.js:44:16 at /usr/local/lib/node_modules/angular-cli/node_modules/portfinder/lib/portfinder.js:117:16 at Server.onError (/usr/local/lib/node_modules/angular-cli/node_modules/portfinder/lib/portfinder.js:54:14) at Server.g (events.js:260:16) at emitOne (events.js:77:13) at Server.emit (events.js:169:7) at emitErrorNT (net.js:1269:8) at nextTickCallbackWith2Args (node.js:442:9) at process._tickCallback (node.js:356:17)

Mention any other details that might be useful.

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Thanks for your help

[filipesilva]

It seems like there is some problem binding to localhost. Can you try ng serve --host 0.0.0.0 instead?

[doronsever]

If someone still phasing this(mac os), you need to edit /etc/hosts and make sure you have this line: 127.0.0.1 localhost