Flutter: CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate

[WernerRaathAtPolymorph]

When running the same functionality with Dart, all works well. When it runs within a Flutter App, it throws this bad boy:

HandshakeException: Handshake error in client (OS Error: 
I/flutter (26972):      CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate(handshake.cc:393))

I use a Gmail email address and it seems to fail on Discover

final ClientConfig? config = await Discover.discover(emailAddress);

[robert-virkus]

Interesting, do you mind sharing the used email address? You can send it to me directly: robert-at-enough-dot-de

[dfangys]

did you fix it?
I'm facing the same

[robert-virkus]

Hi Guys, in the meantime I have move the discovery part into a dedicated project:
https://github.com/Enough-Software/enough_mail_discovery and https://pub.dev/packages/enough_mail_discovery

I never noticed a problem with a gmail address, when I check a gmail address on the demo on https://enough.de/enough_mail_discovery/ the results are shown correctly, too.

Please provide a project that reproduces the problem so that I can work out problems better.

[dfangys]

so that I can work out problems better.

I'm using my own mail server I have this issue with this package, I'm using other third-party apps like my mail it works fine!

I/flutter ( 6246): Subject: chfjf I/flutter ( 6246): MIME-Version: 1.0 I/flutter ( 6246): Content-Type: multipart/mixed; boundary="DR7yw6pXk0_RPU-kLM" I/flutter ( 6246): Content-Transfer-Encoding: base64 I/flutter ( 6246): I/flutter ( 6246): --DR7yw6pXk0_RPU-kLM I/flutter ( 6246): SMTP-null S: 250-VRFY I/flutter ( 6246): SMTP-null S: 250-ETRN I/flutter ( 6246): SMTP-null S: 250-STARTTLS I/flutter ( 6246): SMTP-null S: 250-ENHANCEDSTATUSCODES I/flutter ( 6246): SMTP-null S: 250-8BITMIME I/flutter ( 6246): SMTP-null S: 250-DSN I/flutter ( 6246): SMTP-null S: 250-SMTPUTF8 I/flutter ( 6246): SMTP-null S: 250 CHUNKING I/flutter ( 6246): SMTP-null C: STARTTLS I/flutter ( 6246): SMTP-null S: 220 2.0.0 Ready to start TLS I/flutter ( 6246): SMTP-null A: STARTTLS: upgrading socket to secure one... E/flutter ( 6246): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: Something went wrong, please try again! MailException: HandshakeException: Handshake error in client (OS Error: E/flutter ( 6246): CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate(handshake.cc:393)) E/flutter ( 6246): HandshakeException: Handshake error in client (OS Error: E/flutter ( 6246): CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate(handshake.cc:393))

[robert-virkus]

@dfangys your problem seems to be different from the original posters one.
Could it be that you are using a self-signed certificate?
Have you tried specifying a bad certificate handler?

final mailClient =  MailClient(account, onBadCertificate: (certificate) {
    print('received bad certificate $certificate');
    // DANGER-ZONE: just accept all certificates
   return true;
},
);

From the docs:

  /// [onBadCertificate] is an optional handler for unverifiable certificates.
  /// The handler receives the [X509Certificate], and can inspect it and decide
  /// (or let the user decide) whether to accept the connection or not.
  /// The handler should return true to continue the [SecureSocket] connection.

[dfangys]

i'll check and reply to you back, thanks

[mike-bambu]

hi @dfangys I have the same problem, could you solve this detail?