QSslSocket: TLS initialization Failed

SGaist · wrote on 27 Dec 2018, 22:03

By default, for international distribution reason, Qt is not linked to OpenSSL but dlopens the dll if available.

And yes, the version is restricted to what was used to build Qt as with any other dependency you may have.

Crag_Hack · wrote on 27 Dec 2018, 22:35

Everything is working beautifully with Shining Light Productions OpenSSL 1.0.2q. Thanks for the help SGaist!

Crag_Hack · wrote on 27 Dec 2018, 22:48

@SGaist said in QSslSocket: TLS initialization Failed:

Yes, as already suggested, use OpenSSL 1.0 since it's the version that was used to build the version of Qt you are using.
As already written, OpenSSL broke API and ABI compatibility between 1.1 and 1.0.
It requires a different backend that is available since 5.10 but you have to select it when building Qt.
If you want OpenSSL 1.1, you should move to Qt 5.12 as IIRC this is now the default backend.

When you say you have to select it when building Qt your'e referring to a static build right? Is there any way to do it for whatever version of dynamic Qt Qt Creator uses? Just curious.

SGaist · wrote on 27 Dec 2018, 23:13

No, static or dynamic build doesn't play a role.

Qt and Qt Creator are two linked but independent projects so I'm not sure what you are asking here.

Crag_Hack · wrote on 28 Dec 2018, 00:23

OK let me explain - when you use the Qt Online Installer you select for it to install 5.12 MSVC 2017 64bit or whatever you wish. That is a preconfigured dynamic build of the Qt libraries right? There's no way to change whatever OpenSSL is used for that Qt build since it's preconfigured right?

SGaist · wrote on 28 Dec 2018, 22:11

Right, you can't switch from the 1.0 to the 1.1 backend used for the reasons already explained.

Ross · 7 May 2019, 16:15

I should like to add as a warning to future folks, which may include myself, that matching the exact version that your Qt libraries are using may be absolutely necessary. Look on the qt wiki for the version of openssl that was compiled against. The page will be of the form https://wiki.qt.io/Qt_5.12_Tools_and_Versions . Once you find your version, one of the links from https://wiki.openssl.org/index.php/Binaries points to https://indy.fulgan.com/SSL/ which has older binaries.

Gwenael · R Ross 3 May 2019, 22:04

@Ross Thank Ross this was exactly my problem : I tried with the 1.1.1 versions of libeay32.dll and ssleay32.dll. With 1.0.2p version (used with Qt5.13 beta) it works perfectly.

Note to other previous answers : no need to add anything in the includepath of the .pro file. Juste add the RIGHT dll's in the same directory than the executable .

Rishabh3354 · 3 Apr 2020, 16:45

steps:

1- Firstly you need to find your SSL version for your windows machine( SSL version strictly depends on QT versions) with this function:

qDebug() << QSslSocket::supportsSsl() << QSslSocket::sslLibraryBuildVersionString() << QSslSocket::sslLibraryVersionString();

After that run your code and call the above function. It will print your required SSL version in application output. In my case, it was “OpenSSL 1.0.2p 14 Aug 2018” “” which may be different for all the users.
Download SSL libraries from here

4- Paste all the files/content of SSL folder (which you have extracted) into the build directory inside the debug folder.

if you have doubt. then visit this post for complete info.

Neptilo · wrote on 3 Apr 2020, 16:45

@Rishabh3354 said in QSslSocket: TLS initialization Failed:

Download SSL libraries from here

Or from here for 1.1.x builds.

By the way, thank you for the summarized step-by-step solution.

DkDkDk · 27 Jul 2020, 09:33

Recently I ran into this problem, Solution I found is .

Open Qt MaintenanceTool
select and install OpenSLL form list
got to .pro file remove old SSL libs and include path from there
Add following libs for OpenSll 1.1.1 d

MSVC_PATH  = "C:/Qt/Qt5.14/5.14.1/mingw73_64"
LIBS += -L$$MSVC_PATH/../../Tools/OpenSSL/Win_x64/lib -lcrypto -lssl
INCLUDEPATH+= $$MSVC_PATH/../../Tools/OpenSSL/Win_x64/include

Changes need to do in is code some old openssl functions are to directly accessible.

Walmont · D DkDkDk 19 May 2020, 11:33

@DkDkDk Thanks dude. I solved my problem thanks to you.

Luc4 · wrote on 6 Nov 2020, 16:46

For those looking for other answers, I had a similar problem. SSL was not working only on some machines, where libssl and libcrypto were properly installed. Problem was related to a missing dependency of libssl/libcrypto. If the Qt app is working, libssl/libcrypto are present and version is correct, also confirm that their deps are present.

Padawan · wrote on 4 Jul 2021, 13:44

For anyone wondering, i'm using Qt 5.15.2 and i just downloaded OpenSSL 1.1.1k here and installed it, and added(prepended) it to Qt PATH in project pane, it didn't work when i went into system variables and put it there. Go to Projects Pane in Qt, click on 'details' in Build Environment part, then scroll down to path and select it, click on prepend path and put in the bin directory of your OPENSSL installation which was located in Program Files in my hard drive