Comment 14 for bug 1981807

I was not able to test it on Ubuntu because I don't have armhf hardware, but I have just tested it on a Debian porterbox. The only difference between Debian bookworm and sid versions of Qt is presence of this patch.

I used this test code and complied it with qmake && make.

mitya57@harris:~/test$ cat test.pro
CONFIG += debug warn_all
QT = core network
SOURCES = test.cpp

mitya57@harris:~/test$ cat test.cpp
#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
#include <QtNetwork/QSslConfiguration>
#include <QtNetwork/QSslSocket>

int main(int argc, char **argv) {
    QCoreApplication app(argc, argv);
    QSslSocket s;
    QSslConfiguration cfg = s.sslConfiguration();
    cfg.setProtocol(QSsl::TlsV1_3OrLater);
    s.setSslConfiguration(cfg);
    s.connectToHostEncrypted("www.ubuntu.com", 443);
    s.waitForConnected();
    qDebug() << s.sessionProtocol();
    return 0;
}

Without patch:

(bookworm_armhf-dchroot)mitya57@harris:~/test$ ./test
-1

With patch:

(sid_armhf-dchroot)mitya57@harris:~/test$ ./test
15