@forca maybe you need to do some additional steps From QSslSocket documentation: Describes the peer verification modes for QSslSocket. The default mode is AutoVerifyPeer, which selects an appropriate mode depending on the socket's QSocket::SslMode. QSslSocket::QueryPeer 1 QSslSocket will request a certificate from the peer, but does not require this certificate to be valid. This is useful when you want to display peer certificate details to the user without affecting the actual SSL handshake. This mode is the default for servers. Note: In Schannel this value acts the same as VerifyNone. And looking at this QWebEnginePage browser example, check the Downloading Favicons code snippet, which may help you accessing the underlying QSslSocket

Self-signed certificate are always the more complicated to manage (i.e. nobody trust them since no valid CA validated them) Sorry, I'm don't remember of such a howto... No, there won't be another release of Qt 5.3. The next release is 5.6.0 the first LTS of Qt 5.

Hi, Glad you found out and thanks for sharing ! Just a side note, you can now mark the thread as solved using the "Topic Tool" button. So there's no need to modify the title anymore.

hi , i have a problem like this, can u help me plz ? my code is about send mail in smtp - tls connection on port 587 , but i have problem when i use socket->startClientEncryption(); and then i have timeout error. plz help me about that. thank u

You should also check the sslErrors signal

mcosta, Yes, found it - not too blind but too stupid :) thank you