diff --git a/src/network/access/qhttp2protocolhandler.cpp b/src/network/access/qhttp2protocolhandler.cpp
index 0abd99b9bc2..3631b13dc85 100644
--- a/src/network/access/qhttp2protocolhandler.cpp
+++ b/src/network/access/qhttp2protocolhandler.cpp
@@ -303,12 +303,12 @@ bool QHttp2ProtocolHandler::sendRequest()
         }
     }
 
-    if (!prefaceSent && !sendClientPreface())
-        return false;
-
     if (!requests.size())
         return true;
 
+    if (!prefaceSent && !sendClientPreface())
+        return false;
+
     m_channel->state = QHttpNetworkConnectionChannel::WritingState;
     // Check what was promised/pushed, maybe we do not have to send a request
     // and have a response already?
diff --git a/src/network/access/qhttpnetworkconnectionchannel.cpp b/src/network/access/qhttpnetworkconnectionchannel.cpp
index 6766989690c..1e4161d1fdf 100644
--- a/src/network/access/qhttpnetworkconnectionchannel.cpp
+++ b/src/network/access/qhttpnetworkconnectionchannel.cpp
@@ -209,6 +209,10 @@ void QHttpNetworkConnectionChannel::abort()
 bool QHttpNetworkConnectionChannel::sendRequest()
 {
     Q_ASSERT(protocolHandler);
+    if (waitingForPotentialAbort) {
+        needInvokeSendRequest = true;
+        return false; // this return value is unused
+    }
     return protocolHandler->sendRequest();
 }
 
@@ -221,21 +225,28 @@ bool QHttpNetworkConnectionChannel::sendRequest()
 void QHttpNetworkConnectionChannel::sendRequestDelayed()
 {
     QMetaObject::invokeMethod(this, [this] {
-        Q_ASSERT(protocolHandler);
         if (reply)
-            protocolHandler->sendRequest();
+            sendRequest();
     }, Qt::ConnectionType::QueuedConnection);
 }
 
 void QHttpNetworkConnectionChannel::_q_receiveReply()
 {
     Q_ASSERT(protocolHandler);
+    if (waitingForPotentialAbort) {
+        needInvokeReceiveReply = true;
+        return;
+    }
     protocolHandler->_q_receiveReply();
 }
 
 void QHttpNetworkConnectionChannel::_q_readyRead()
 {
     Q_ASSERT(protocolHandler);
+    if (waitingForPotentialAbort) {
+        needInvokeReadyRead = true;
+        return;
+    }
     protocolHandler->_q_readyRead();
 }
 
@@ -1239,7 +1250,18 @@ void QHttpNetworkConnectionChannel::_q_encrypted()
         if (!h2RequestsToSend.isEmpty()) {
             // Similar to HTTP/1.1 counterpart below:
             const auto &pair = std::as_const(h2RequestsToSend).first();
+            waitingForPotentialAbort = true;
             emit pair.second->encrypted();
+
+            // We don't send or handle any received data until any effects from
+            // emitting encrypted() have been processed. This is necessary
+            // because the user may have called abort(). We may also abort the
+            // whole connection if the request has been aborted and there is
+            // no more requests to send.
+            QMetaObject::invokeMethod(this,
+                                      &QHttpNetworkConnectionChannel::checkAndResumeCommunication,
+                                      Qt::QueuedConnection);
+
             // In case our peer has sent us its settings (window size, max concurrent streams etc.)
             // let's give _q_receiveReply a chance to read them first ('invokeMethod', QueuedConnection).
         }
@@ -1257,6 +1279,28 @@ void QHttpNetworkConnectionChannel::_q_encrypted()
     QMetaObject::invokeMethod(connection, "_q_startNextRequest", Qt::QueuedConnection);
 }
 
+
+void QHttpNetworkConnectionChannel::checkAndResumeCommunication()
+{
+    Q_ASSERT(connection->connectionType() == QHttpNetworkConnection::ConnectionTypeHTTP2
+             || connection->connectionType() == QHttpNetworkConnection::ConnectionTypeHTTP2Direct);
+
+    // Because HTTP/2 requires that we send a SETTINGS frame as the first thing we do, and respond
+    // to a SETTINGS frame with an ACK, we need to delay any handling until we can ensure that any
+    // effects from emitting encrypted() have been processed.
+    // This function is called after encrypted() was emitted, so check for changes.
+
+    if (!reply && h2RequestsToSend.isEmpty())
+        abort();
+    waitingForPotentialAbort = false;
+    if (needInvokeReadyRead)
+        _q_readyRead();
+    if (needInvokeReceiveReply)
+        _q_receiveReply();
+    if (needInvokeSendRequest)
+        sendRequest();
+}
+
 void QHttpNetworkConnectionChannel::requeueHttp2Requests()
 {
     const auto h2RequestsToSendCopy = std::exchange(h2RequestsToSend, {});
diff --git a/src/network/access/qhttpnetworkconnectionchannel_p.h b/src/network/access/qhttpnetworkconnectionchannel_p.h
index c42290feca4..061f20fd426 100644
--- a/src/network/access/qhttpnetworkconnectionchannel_p.h
+++ b/src/network/access/qhttpnetworkconnectionchannel_p.h
@@ -74,6 +74,10 @@ public:
     QAbstractSocket *socket;
     bool ssl;
     bool isInitialized;
+    bool waitingForPotentialAbort = false;
+    bool needInvokeReceiveReply = false;
+    bool needInvokeReadyRead = false;
+    bool needInvokeSendRequest = false;
     ChannelState state;
     QHttpNetworkRequest request; // current request, only used for HTTP
     QHttpNetworkReply *reply; // current reply for this request, only used for HTTP
@@ -146,6 +150,8 @@ public:
     void closeAndResendCurrentRequest();
     void resendCurrentRequest();
 
+    void checkAndResumeCommunication();
+
     bool isSocketBusy() const;
     bool isSocketWriting() const;
     bool isSocketWaiting() const;