serverless offline won't run offline: Failed to load resource: net::ERR_CONNECTION_REFUSED - serverless

Question

PROBLEM
I cannot get serverless offline to run when not connected to internet.
serverless.yml
service: my-app
plugins:
- serverless-offline
# run on port 4000, because client runs on 3000
custom:
serverless-offline:
port: 4000
# app and org for use with dashboard.serverless.com
app: my-app
org: my-org
provider:
name: aws
runtime: nodejs10.x
functions:
getData:
handler: data-service.getData
events:
- http:
path: data/get
method: get
cors: true
isOffline: true
saveData:
handler: data-service.saveData
events:
- http:
path: data/save
method: put
cors: true
isOffline: true
To launch serverless offline, I run serverless offline start in terminal. This works when I am connected to the internet, but when offline, I get the following errors:
Console Error
:4000/data/get:1 Failed to load resource: net::ERR_CONNECTION_REFUSED
20:34:02.820 localhost/:1 Uncaught (in promise) TypeError: Failed to fetch
Terminal Error
FetchError: request to https://api.serverless.com/core/tenants/{tenant}/applications/my-app/profileValue failed, reason: getaddrinfo ENOTFOUND api.serverless.com api.serverless.com:443
Request
I suspect the cause is because I am not sure how to setup offline using instruction: "The event object passed to your λs has one extra key: { isOffline: true }. Also, process.env.IS_OFFLINE is true."
Any assistance on how to debug the issue would be much appreciated.

Answer 1

Probably you already fix it, but the problem is because app and org attribute
# app and org for use with dashboard.serverless.com
app: my-app
org: my-org
When you use it, serverless will use config set on serverless.com, commonly env var.
To use env var, you can use plugin serverless-dotenv-plugin. This way, you don't need to connect on internet.