Why sequelize doesn't connect to DB when system is offline?

I try to run my project when my computer is offline but it showed me this error:

Unhandled rejection SequelizeConnectionError: getaddrinfo ENOENT
    at C:\Users\moslem\WebstormProjects\exchange\node_modules\sequelize\lib\dial
ects\postgres\connection-manager.js:74:20
    at null.<anonymous> (C:\Users\moslem\WebstormProjects\exchange\node_modules\
pg\lib\client.js:176:5)
    at emit (events.js:107:17)
    at Socket.<anonymous> (C:\Users\moslem\WebstormProjects\exchange\node_module
s\pg\lib\connection.js:59:10)
    at Socket.emit (events.js:107:17)
    at net.js:923:16
    at process._tickCallback (node.js:355:11)

after that I connected to internet then everything works as expected

[moslemezzati]

I found out where is issue my config file is set like this:

 "development": {
    "username": "postgres",
    "password": "1",
    "database": "exchange",
    "host": "localhost",
    "dialect": "postgres",
    "port": "5432"
  },

and I changed it to this:

 "development": {
    "username": "postgres",
    "password": "1",
    "database": "exchange",
    "host": "127.0.0.1",
    "dialect": "postgres",
    "port": "5432"
  },

And then everything worked fine. Did you have this experience before?

[Jandsonn]

Deu certo aqui também, eu estava com o mesmo problema coloquei o endereço host local e e deu certo. Obrigado irmãozinho