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qt: Revert "Force TLS1.0+ for SSL connections"
This reverts commit 15e26a6, whose purpose was to tweak the Qt configuration to force TLS, i.e., to disable SSLv3, in Qt versions >= 5.5. However, the default behavior of Qt >= 5.4 is to disable SSLv3 anyway [1], so the configuration tweak is redundant. With Qt 5.11.2, the configuration tweak is not only redundant but in fact provokes a deadlock (bitcoin#14359) due to Qt 5.11.2 being incompatible with OpenSSL 1.1.1 [2]. Since the deadlock occurs at the early startup stage of bitcoin-qt, it renders bitcoin-qt entirely non-functional when compiled against OpenSSL 1.1.1 and Qt 5.11.2 (and possible future combinations of OpenSSL and Qt versions). This commit fixes bitcoin#14359 by removing the redundant code. [1] https://code.qt.io/cgit/qt/qtbase.git/commit/?id=3fd2d9eff8c1f948306ee5fbfe364ccded1c4b84 [2] https://bugreports.qt.io/browse/QTBUG-70956 Github-Pull: bitcoin#14403 Rebased-From: 7d173c4 Tree-SHA512: 71a34b13202c834c5ca73bcb9b70efff26c34e1aac3b954f098620b62c2be53a8e319929c4764a5b5cc5d0dd163ff70f4eb3a4f1f608363b7d23d1b16b25ddc7
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