Newbie - Getting "IO : HTTP error: | TlsException: Failure trusting builtin roots (OS Error: errno = 0)" with example dart web app.

[Manfred Usselmann]

I've just installed the Dart sdk and tried to run the example Dart Web App in WebStorm.

I get "502 Bad Gateway" in the browser.

The event log contains:

D:\dart-sdk\bin\pub.bat global run webdev serve web:53322
No active package webdev.
Dart Webdev terminated

To analyse the problem I entered the following command in PowerShell:

pub global activate webdev -v

FINE: Pub 2.4.1

IO  : Spawning "cmd /c ver" in P:\.

IO  : Finished ver. Exit code 0.

    | stdout:

    | |

    | | Microsoft Windows [Version 10.0.16299.1268]

    | Nothing output on stderr.

MSG : Resolving dependencies...

SLVR: fact: pub global activate is 0.0.0

SLVR: derived: pub global activate

SLVR: fact: pub global activate depends on webdev any

SLVR:   selecting pub global activate

SLVR:   derived: webdev any

IO  : Get versions from https://pub.dartlang.org/api/packages/webdev.

IO  : HTTP GET https://pub.dartlang.org/api/packages/webdev

    | Accept: application/vnd.pub.v2+json

    | X-Pub-OS: windows

    | X-Pub-Command: global activate

    | X-Pub-Session-ID: 4F728B31-0FFB-4DB4-A160-C6EABA56143C

    | user-agent: Dart pub 2.4.1

IO  : HTTP error:

    | TlsException: Failure trusting builtin roots (OS Error: errno = 0)

    |

    | dart:_http                                   _HttpClient.openUrl

    | package:http/src/io_client.dart 33:36        IOClient.send

    | ===== asynchronous gap ===========================

    | dart:async                                   _asyncThenWrapperHelper

    | package:http_throttle/http_throttle.dart     ThrottleClient.send

    | package:http/src/base_client.dart 169:38     BaseClient._sendUnstreamed

    | ===== asynchronous gap ===========================

    | dart:async                                   _asyncThenWrapperHelper

    | package:pub/src/solver/version_solver.dart   VersionSolver.solve

    | package:pub/src/solver.dart 35:10            resolveVersions.<fn>

    | package:pub/src/log.dart 378:18              progress

    | package:pub/src/solver.dart 32:10            resolveVersions

    | package:pub/src/global_packages.dart 183:22  GlobalPackages._installInCache

IO  : Retry #1 for GET https://pub.dartlang.org/api/packages/webdev...

IO  : HTTP GET https://pub.dartlang.org/api/packages/webdev

    | Accept: application/vnd.pub.v2+json

    | X-Pub-OS: windows

    | X-Pub-Command: global activate

    | X-Pub-Session-ID: 4F728B31-0FFB-4DB4-A160-C6EABA56143C

    | user-agent: Dart pub 2.4.1

How can I fix this error "HTTP error: TlsException: Failure trusting builtin roots (OS Error: errno = 0)"?

I tried to solve the problem by providing the root certificate from https://github.com/dart-lang/root_certificates/blob/master/certdata.pem

$env:DART_VM_OPTIONS="--root-certs-file=D:\dart-sdk\certdata.pem"

but this didn't help either.