Help: TLS 1.3 Support in Qt 5.12.12 for iOS

[CellCS]

I tried with

sslConfig = QSslConfiguration::defaultConfiguration();
sslConfig.setProtocol(QSsl::TlsV1_3OrLater);

But can not connect with TLS1.3 API server.

Thanks for your help and suggestions.

[jeremy_k]

Qt 5 on macOS didn't support TLS 1.3 in the prebuilt QtNetwork.framework. The underlying platform facility, secure transport, stopped development with TLS 1.2. This could be worked around by rebuilding Qt to use OpenSSL instead.

I haven't used Qt on iOS, or even examined the source. My mostly unfounded guess is that a similar if not identical situation applies.