flutter-grpc example does not work

[makorne]

android:

Launching lib/main.dart on sdk gphone x86 arm in debug mode...
Running Gradle task 'assembleDebug'...
✓  Built build/app/outputs/flutter-apk/app-debug.apk.
Installing build/app/outputs/flutter-apk/app.apk...
Debug service listening on ws://127.0.0.1:37627/MK0kJdXocbU=/ws
Syncing files to device sdk gphone x86 arm...
E/flutter ( 5775): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: gRPC Error (code: 14, codeName: UNAVAILABLE, message: Error connecting: SocketException: OS Error: Connection refused, errno = 111, address = todoworld.servicestack.net, port = 46266, details: null, rawResponse: null)
E/flutter ( 5775): 
I/chatty  ( 5775): uid=10155(com.example.flutter_grpc) 1.ui identical 12 lines
E/flutter ( 5775): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: gRPC Error (code: 14, codeName: UNAVAILABLE, message: Error connecting: SocketException: OS Error: Connection refused, errno = 111, address = todoworld.servicestack.net, port = 46266, details: null, rawResponse: null)
E/flutter ( 5775): 

chrome:

Launching lib/main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...
This app is linked to the debug service: ws://127.0.0.1:34811/Myw57rTJB5k=/ws
Debug service listening on ws://127.0.0.1:34811/Myw57rTJB5k=/ws

Running with unsound null safety
For more information see https://dart.dev/null-safety/unsound-null-safety
Debug service listening on ws://127.0.0.1:34811/Myw57rTJB5k=/ws
Error: gRPC Error (code: 14, codeName: UNAVAILABLE, message: Error connecting: Unsupported operation: SecurityContext constructor, details: null, rawResponse: null)


    at Object.createErrorWithStack (http://localhost:35847/dart_sdk.js:5362:12)
    at Object._rethrow (http://localhost:35847/dart_sdk.js:39548:16)
    at async._AsyncCallbackEntry.new.callback (http://localhost:35847/dart_sdk.js:39542:13)
    at Object._microtaskLoop (http://localhost:35847/dart_sdk.js:39374:13)
    at _startMicrotaskLoop (http://localhost:35847/dart_sdk.js:39380:13)
    at http://localhost:35847/dart_sdk.js:34887:9
Error: gRPC Error (code: 14, codeName: UNAVAILABLE, message: Error connecting: Unsupported operation: SecurityContext constructor, details: null, rawResponse: null)