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This problem is connected with Qt5 I believe, starting QGIS from the command line gives, amongst many other messages:

Warning: Incompatible version of OpenSSL
Warning: QSslSocket: cannot call unresolved function d2i_X509
Warning: QSslSocket::connectToHostEncrypted: TLS initialization failed.

The desktop looks like this when trying to connect to a WMS server:

QGIS 3.34.1 can't connect to WMS

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  • Please paste the error message as text rather a screenshot.
    – Padmanabha
    Dec 8, 2023 at 14:00
  • OK, sorry, I thought a small screenshot may help, in case anyone else has had a similar problem. Dec 8, 2023 at 15:27
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    A solution here maybe? stackoverflow.com/questions/58625924/…
    – GBG
    Dec 8, 2023 at 15:35
  • On my machine openssl version gives OpenSSL 3.0.2 15 Mar 2022 (Library: OpenSSL 3.0.2 15 Mar 2022) and I have no WMS issues with QGIS version 3.34.1-Prizren Qt version 5.15.3
    – Ian Turton
    Dec 8, 2023 at 16:47
  • Ian, is yours a Windows machine? I'm using Ubuntu 22.04. I suspect that the Qt5 libraries used for the latest QGIS build can only cope with OpenSSL 1.1, on my setup. But I don't know for sure. Dec 8, 2023 at 17:24

1 Answer 1

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As I have spent a long time sorting this out, in my case the problem was fixed by removing an old symlink linking /lib/x86_64-linux-gnu/libssl.so.1.1 to /lib/x86_64-linux-gnu/libssl.so. Removing (deleting) the link /lib/x86_64-linux-gnu/libssl.so fixed it for me (I don't know where the link came from, or if removing it broke anything else). In a separate machine this link is not there and causes no problems (both Debian 11).

(not posted as a comment, as I don't have enough reputation)

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