1 files changed, 4 insertions, 0 deletions
diff --git a/src/network/ssl/qsslsocket_winrt.cpp b/src/network/ssl/qsslsocket_winrt.cpp
index 53a8a8b61b..e72edcbc52 100644
--- a/src/network/ssl/qsslsocket_winrt.cpp
+++ b/src/network/ssl/qsslsocket_winrt.cpp
@@ -647,6 +647,10 @@ HRESULT QSslSocketBackendPrivate::onSslUpgrade(IAsyncAction *action, AsyncStatus
     connectionEncrypted = true;
     emit q->encrypted();
 
+    // The write buffer may already have data written to it, so we need to call transmit.
+    // This has to be done in 'q's thread, and not in the current thread (the XAML thread).
+    QMetaObject::invokeMethod(q, [this](){ transmit(); });
+
     if (pendingClose) {
         pendingClose = false;
         q->disconnectFromHost();