Hi, I have a VB.NET application in i am trying to send GMAIL mails using the GMAIL OAUTH2 API`s provided on Chilkat. The link which i am following is:

http://www.example-code.com/vbnet/smtp_gmailOAuth2.asp

Now the issue is that, i have everything by the book which is described here but still i am getting this error at the tail end. I wont print the whole Error Log but i think this is the error:

"failed to login using XOAUTH2 method".

The code i am using is this:

 Dim iss As String = "********"

Dim scope As String = "https://mail.google.com/"

Dim sub1 As String = ""

Dim numSec As Integer = 3600

Dim accessToken As String = http.G_SvcOauthAccessToken(iss, scope, sub1, numSec, cert)

If (accessToken = vbNullString) Then

Console.WriteLine(http.LastErrorText)

Exit Function

Else

Console.WriteLine("access token: " & accessToken)

End If

Dim mailman As New Chilkat.MailMan()

'  Set the properties for the GMail SMTP server:

mailman.SmtpHost = "smtp.gmail.com"

mailman.SmtpPort = 587

mailman.StartTLS = True

mailman.SmtpUsername = "retroaa123@gmail.com"
        mailman.OAuth2AccessToken = accessToken

'  Create a new email object
        Dim email As New Chilkat.Email()

email.Subject = "This is a test"
        email.Body = "This is a test"
        email.From = "retroaa123@gmail.com"
        success = email.AddTo("Myself", "retroaa123@gmail.com")
        '  To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

'  Call SendEmail to connect to the SMTP server and send.
        '  The connection (i.e. session) to the SMTP server remains
        '  open so that subsequent SendEmail calls may use the
        '  same connection.
        success = mailman.SendEmail(email)

The LastErrorText is :

ChilkatLog:
  SendEmail:
    DllDate: Oct 29 2015
    ChilkatVersion: 9.5.0.54
    UnlockPrefix: 30-day trial
    Username: RMOPS34:Haris.Tasawar
    Architecture: Little Endian; 32-bit
    Language: .NET 4.5
    VerboseLogging: 0
    sendEmailInner:
      renderToMime:
        createEmailForSending:
          xSigningAlg: sha1
          Auto-generating Message-ID
        --createEmailForSending
        renderToMime: Elapsed time: 0 millisec
      --renderToMime
      sendMimeInner:
        progressTotal: 584
        ensureSmtpSession:
          ensureSmtpConnection:
            SmtpHost: smtp.gmail.com
            SmtpPort: 587
            SmtpUsername: retroaa123@gmail.com
            SmtpSsl: 0
            StartTLS: 1
            smtpConnect:
              smtpHostname: smtp.gmail.com
              smtpPort: 587
              connectionIsReady:
                Need new SMTP connection
              --connectionIsReady
              smtpSocketConnect:
                socketOptions:
                  SO_SNDBUF: 262144
                  SO_RCVBUF: 4194304
                  TCP_NODELAY: 1
                  SO_KEEPALIVE: 1
                --socketOptions
              --smtpSocketConnect
              smtpGreeting:
                readSmtpResponse:
                  SmtpCmdResp: 220 smtp.gmail.com ESMTP w124sm28507454wmg.17 - gsmtp
                --readSmtpResponse
              --smtpGreeting
              startTLS:
                Will be using STARTTLS...
                sendCmdToSmtp:
                  SmtpCmdSent: EHLO RMOPS34<crlf>
                --sendCmdToSmtp
                readSmtpResponse:
                  SmtpCmdResp: 250-smtp.gmail.com at your service, [80.227.130.130]
                  SmtpCmdResp: 250-SIZE 35882577
                  SmtpCmdResp: 250-8BITMIME
                  SmtpCmdResp: 250-STARTTLS
                  SmtpCmdResp: 250-ENHANCEDSTATUSCODES
                  SmtpCmdResp: 250-PIPELINING
                  SmtpCmdResp: 250-CHUNKING
                  SmtpCmdResp: 250 SMTPUTF8
                --readSmtpResponse
                sendCmdToSmtp:
                  SmtpCmdSent: STARTTLS<crlf>
                --sendCmdToSmtp
                readSmtpResponse:
                  SmtpCmdResp: 220 2.0.0 Ready to start TLS
                --readSmtpResponse
                TLS connection established.
              --startTLS
              ehloCommand:
                sendCmdToSmtp:
                  SmtpCmdSent: EHLO RMOPS34<crlf>
                --sendCmdToSmtp
                readSmtpResponse:
                  SmtpCmdResp: 250-smtp.gmail.com at your service, [80.227.130.130]
                  SmtpCmdResp: 250-SIZE 35882577
                  SmtpCmdResp: 250-8BITMIME
                  SmtpCmdResp: 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
                  SmtpCmdResp: 250-ENHANCEDSTATUSCODES
                  SmtpCmdResp: 250-PIPELINING
                  SmtpCmdResp: 250-CHUNKING
                  SmtpCmdResp: 250 SMTPUTF8
                --readSmtpResponse
              --ehloCommand
            --smtpConnect
          --ensureSmtpConnection
          ensureSmtpAuthenticated:
            smtpAuthenticate:
              smtp_host: smtp.gmail.com
              smtp_port: 587
              smtp_user: retroaa123@gmail.com
              smtpAuthenticate:
                login_method: XOAUTH2
                auth_xoauth2:
                  username: retroaa123@gmail.com
                  sendCmdToSmtp:
                    SmtpCmdSent: {PasswordOrCredentials}
                  --sendCmdToSmtp
                  readSmtpResponse:
                    SmtpCmdResp: 334 eyJzdGF0dXMiOiI0MDAiLCJzY2hlbWVzIjoiQmVhcmVyIiwic2NvcGUiOiJodHRwczovL21haWwuZ29vZ2xlLmNvbS8ifQ==
                  --readSmtpResponse
                --auth_xoauth2
                Failed to login using XOAUTH2 method
              --smtpAuthenticate
              ConnectionType: SSL/TLS
            --smtpAuthenticate
          --ensureSmtpAuthenticated
        --ensureSmtpSession
      --sendMimeInner
    --sendEmailInner
    Failed.
  --SendEmail
--ChilkatLog

Any help would be appreciated.

Thanks, Haris.

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Gmail Email using OAUTH2 exception

Dec 28 '15 at 20:35

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