Qt 6.2.0 - beta 3 - Qt Network: qt.network.ssl: No functional TLS backend was found

mingr

From the document here: https://doc-snapshots.qt.io/qt6-dev/ssl.html

By default, an SSL-enabled Qt library dynamically loads any installed OpenSSL library at run-time.

I used OpenSSL 1.1.1j Toolkit and windeployqt and I am pretty sure that libcrypto-1_1-x64.dll and libssl-1_1-x64.dll are in the same folder as the executable when deploying.

On qt 5.15, all seems good, but when trying to migrate to Qt 6.2.0, qt.network.ssl: No functional TLS backend was found will show up.

Something weird in cmake that I noticed as well, It will do some package search even if I do not require it.

-- Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY) (found version "1.1.1g")
-- Found WrapOpenSSLHeaders: C:/Strawberry/c/include (found version "1.1.1g")

Not quite sure if these are relevant.

Thank you for the help!

mingr

Seems like windeployqt does not deploy necessary plugins for qt network to work. If I copy the whole plugin folder, it seems to work.

Still trying to figure out which and OPENSSL_INCLUDE_DIR is needed to give to cmake inorder to prevent it from grabbing Strawberry

mingr

Found:
6.2.0\msvc2019_64\plugins\tls

all plugins in this folder are needed

and plugins\tls folder structure is needed to be maintained

I will open an issue

jtooker

Is this the bug you filed? https://bugreports.qt.io/browse/QTBUG-95247 ~~For what it is worth, I'm having the same issue with Qt 6.4.2 (bug says it was fixed in Qt 6.2)~~. Edit: I had a separate bug. windeployqt appears to be doing its job in Qt 6.4.2.