Failed to read beginning of SSL/TLS record – can be caused by External Firewall

If the problem is with Office365, such as with SendEmail to, port 587, then updating to Chilkat v9.5.0.93 or later will solve the problem. For example, if you see the following, then update to v9.5.0.93 or later. … ensureSmtpSession: ensureSmtpConnection: smtpParams: SmtpHost: SmtpPort: 587 SmtpUsername: … SmtpSsl: 0 StartTLS: 1 –smtpParams smtpConnect: smtpHostname: smtpPort: 587 connectionIsReady: SMTP […]

Damn You Windows Firewall!

One particular cause of the following error is finally known: sockRecv(47ms): WindowsError: An existing connection was forcibly closed by the remote host. WindowsErrorCode: 0x2746 numBytesRequested: 5 Failed to receive data on the TCP socket –sockRecv sockRecv failed. sockRecvN_buf: Did not receive the exact number of bytes desired. numBytesToReceive: 5 This error was caused by the Windows Firewall doing stateful FTP […]