When I try to start a server in Express.js I getting this error:

[nodemon] 2.0.12
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node main listen.js`
events.js:352
      throw er; // Unhandled 'error' event
      ^

Error: listen EACCES: permission denied 0.0.0.0:8090
    at Server.setupListenHandle [as _listen2] (net.js:1303:21)
    at listenInCluster (net.js:1368:12)
    at Server.listen (net.js:1454:7)
    at Function.listen (C:\Users\selcuk\Desktop\work\project\node_modules\express\lib\application.js:618:24)
    at Object.<anonymous> (C:\Users\selcuk\Desktop\work\project\listen.js:4:5)
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
Emitted 'error' event on Server instance at:
    at emitErrorNT (net.js:1347:8)
    at processTicksAndRejections (internal/process/task_queues.js:82:21) {
  code: 'EACCES',
  errno: -4092,
  syscall: 'listen',
  address: '0.0.0.0',
  port: 8090
}
[nodemon] app crashed - waiting for file changes before starting...

I try to change the port but it didn't work. I am using "express": "^4.17.1" and "nodemon": "^2.0.12" as a version.

CodePudding user response：

I have an answer that I think will help. it fixed the issue for me. there is cases where nothing is running on the port but some applications or even your code can not run the fix to this is in this order:

Open PowerShell as Admin.

stop winnat with command below:

net stop winnat

start winnat again with command below:

net start winnat

this fixed the problem for me in many cases. no restart needed. I hope it will help you too.