diff --git a/libraries/networking/src/LimitedNodeList.cpp b/libraries/networking/src/LimitedNodeList.cpp
index f474b1766b..fe4efb3de1 100644
--- a/libraries/networking/src/LimitedNodeList.cpp
+++ b/libraries/networking/src/LimitedNodeList.cpp
@@ -62,7 +62,9 @@ LimitedNodeList::LimitedNodeList(unsigned short socketListenPort, unsigned short
         NodeType::init();
 
         // register the SharedNodePointer meta-type for signals/slots
+        qRegisterMetaType<QSharedPointer<Node>>();
         qRegisterMetaType<SharedNodePointer>();
+
         firstCall = false;
     }
 
@@ -175,24 +177,30 @@ void LimitedNodeList::changeSocketBufferSizes(int numBytes) {
 
 bool LimitedNodeList::packetSourceAndHashMatch(const NLPacket& packet, SharedNodePointer& matchingNode) {
     
-    if (!NON_VERIFIED_PACKETS.contains(packet.getType()) && !NON_SOURCED_PACKETS.contains(packet.getType())) {
+    if (NON_SOURCED_PACKETS.contains(packet.getType())) {
+        return true;
+    } else {
         // figure out which node this is from
         matchingNode = nodeWithUUID(packet.getSourceID());
         
         if (matchingNode) {
-            // check if the md5 hash in the header matches the hash we would expect
-            if (packet.getVerificationHash() == packet.payloadHashWithConnectionUUID(matchingNode->getConnectionSecret())) {
-                return true;
-            } else {
-                static QMultiMap<QUuid, PacketType::Value> hashDebugSuppressMap;
-                
-                const QUuid& senderID = packet.getSourceID();
+            if (!NON_VERIFIED_PACKETS.contains(packet.getType())) {
+                // check if the md5 hash in the header matches the hash we would expect
+                if (packet.getVerificationHash() != packet.payloadHashWithConnectionUUID(matchingNode->getConnectionSecret())) {
+                    static QMultiMap<QUuid, PacketType::Value> hashDebugSuppressMap;
+                    
+                    const QUuid& senderID = packet.getSourceID();
 
-                if (!hashDebugSuppressMap.contains(senderID, packet.getType())) {
-                    qCDebug(networking) << "Packet hash mismatch on" << packet.getType() << "- Sender" << senderID;
+                    if (!hashDebugSuppressMap.contains(senderID, packet.getType())) {
+                        qCDebug(networking) << "Packet hash mismatch on" << packet.getType() << "- Sender" << senderID;
 
-                    hashDebugSuppressMap.insert(senderID, packet.getType());
+                        hashDebugSuppressMap.insert(senderID, packet.getType());
+                    }
+
+                    return false;
                 }
+
+                return true;
             }
         } else {
             static QString repeatedMessage
@@ -201,8 +209,6 @@ bool LimitedNodeList::packetSourceAndHashMatch(const NLPacket& packet, SharedNod
             qCDebug(networking) << "Packet of type" << packet.getType() << "received from unknown node with UUID"
                 << qPrintable(uuidStringWithoutCurlyBraces(packet.getSourceID()));
         }
-    } else {
-        return true;
     }
 
     return false;
diff --git a/libraries/networking/src/NLPacket.cpp b/libraries/networking/src/NLPacket.cpp
index db4322bccd..d1fabb1c15 100644
--- a/libraries/networking/src/NLPacket.cpp
+++ b/libraries/networking/src/NLPacket.cpp
@@ -30,8 +30,17 @@ qint64 NLPacket::localHeaderSize() const {
 }
 
 std::unique_ptr<NLPacket> NLPacket::create(PacketType::Value type, qint64 size) {
-    auto packet = std::unique_ptr<NLPacket>(new NLPacket(type, size));
+    std::unique_ptr<NLPacket> packet;
     
+    if (size == -1) {
+        packet = std::unique_ptr<NLPacket>(new NLPacket(type));
+    } else {
+        // Fail with invalid size
+        Q_ASSERT(size >= 0);
+
+        packet = std::unique_ptr<NLPacket>(new NLPacket(type, size));
+    }
+        
     packet->open(QIODevice::WriteOnly);
     
     return packet;
@@ -44,7 +53,7 @@ std::unique_ptr<NLPacket> NLPacket::fromReceivedPacket(std::unique_ptr<char> dat
     
     // Fail with invalid size
     Q_ASSERT(size >= 0);
-    
+
     // allocate memory
     auto packet = std::unique_ptr<NLPacket>(new NLPacket(std::move(data), size, senderSockAddr));
 
@@ -64,7 +73,22 @@ std::unique_ptr<NLPacket> NLPacket::createCopy(const NLPacket& other) {
     return packet;
 }
 
-NLPacket::NLPacket(PacketType::Value type, qint64 size) : Packet(type, localHeaderSize(type) + size) {
+NLPacket::NLPacket(PacketType::Value type, qint64 size) :
+    Packet(type, localHeaderSize(type) + size)
+{
+    Q_ASSERT(size >= 0);
+    
+    qint64 headerSize = localHeaderSize(type);
+    _payloadStart += headerSize;
+    _capacity -= headerSize;
+}
+
+NLPacket::NLPacket(PacketType::Value type) :
+    Packet(type, -1)
+{
+    qint64 headerSize = localHeaderSize(type);
+    _payloadStart += headerSize;
+    _capacity -= headerSize;
 }
 
 NLPacket::NLPacket(const NLPacket& other) : Packet(other) {
diff --git a/libraries/networking/src/NLPacket.h b/libraries/networking/src/NLPacket.h
index c11ca0790b..0c9d31c66e 100644
--- a/libraries/networking/src/NLPacket.h
+++ b/libraries/networking/src/NLPacket.h
@@ -12,6 +12,8 @@
 #ifndef hifi_NLPacket_h
 #define hifi_NLPacket_h
 
+#include <QtCore/QSharedPointer>
+
 #include "udt/Packet.h"
 
 class NLPacket : public Packet {
@@ -35,6 +37,7 @@ public:
     QByteArray payloadHashWithConnectionUUID(const QUuid& connectionUUID) const;
 
 protected:
+    NLPacket(PacketType::Value type);
     NLPacket(PacketType::Value type, qint64 size);
     NLPacket(std::unique_ptr<char> data, qint64 size, const HifiSockAddr& senderSockAddr);
     NLPacket(const NLPacket& other);
diff --git a/libraries/networking/src/NodeList.cpp b/libraries/networking/src/NodeList.cpp
index 69dc1052ac..2e6763dc3a 100644
--- a/libraries/networking/src/NodeList.cpp
+++ b/libraries/networking/src/NodeList.cpp
@@ -38,14 +38,6 @@ NodeList::NodeList(char newOwnerType, unsigned short socketListenPort, unsigned
     _numNoReplyDomainCheckIns(0),
     _assignmentServerSocket()
 {
-    static bool firstCall = true;
-    if (firstCall) {
-        NodeType::init();
-        // register the SharedNodePointer meta-type for signals/slots
-        qRegisterMetaType<SharedNodePointer>();
-        firstCall = false;
-    }
-
     setCustomDeleter([](Dependency* dependency){
         static_cast<NodeList*>(dependency)->deleteLater();
     });
diff --git a/libraries/networking/src/PacketReceiver.cpp b/libraries/networking/src/PacketReceiver.cpp
index 06b61a3391..7af4905834 100644
--- a/libraries/networking/src/PacketReceiver.cpp
+++ b/libraries/networking/src/PacketReceiver.cpp
@@ -21,7 +21,7 @@ PacketReceiver::PacketReceiver(QObject* parent) :
     QObject(parent),
     _packetListenerMap()
 {
-
+    qRegisterMetaType<QSharedPointer<NLPacket>>();
 }
 
 void PacketReceiver::registerListenerForTypes(const QSet<PacketType::Value>& types, PacketListener* listener, const char* slot) {
@@ -206,7 +206,7 @@ void PacketReceiver::processDatagrams() {
         _inByteCount += packetSizeWithHeader;
 
         if (packetVersionMatch(*packet)) {
-
+            
             SharedNodePointer matchingNode;
             if (nodeList->packetSourceAndHashMatch(*packet, matchingNode)) {
 
@@ -227,6 +227,7 @@ void PacketReceiver::processDatagrams() {
                     if (listener.first) {
 
                         bool success = false;
+                        PacketType::Value packetType = packet->getType();
 
                         if (matchingNode) {
                             // if this was a sequence numbered packet we should store the last seq number for
@@ -238,12 +239,20 @@ void PacketReceiver::processDatagrams() {
                             emit dataReceived(matchingNode->getType(), packet->getSizeWithHeader());
                             QMetaMethod metaMethod = listener.second;
 
-                            static const QByteArray SHARED_NODE_NORMALIZED = QMetaObject::normalizedType("QSharedPointer<Node>");
+                            static const QByteArray QSHAREDPOINTER_NODE_NORMALIZED = QMetaObject::normalizedType("QSharedPointer<Node>");
+                            static const QByteArray SHARED_NODE_NORMALIZED = QMetaObject::normalizedType("SharedNodePointer");
 
                             if (metaMethod.parameterTypes().contains(SHARED_NODE_NORMALIZED)) {
+                                qDebug() << "invoking with matchingNode" << matchingNode;
                                 success = metaMethod.invoke(listener.first,
-                                    Q_ARG(QSharedPointer<NLPacket>, QSharedPointer<NLPacket>(packet.release())),
-                                    Q_ARG(SharedNodePointer, matchingNode));
+                                        Q_ARG(QSharedPointer<NLPacket>, QSharedPointer<NLPacket>(packet.release())),
+                                        Q_ARG(SharedNodePointer, matchingNode));
+
+                            } else if (metaMethod.parameterTypes().contains(QSHAREDPOINTER_NODE_NORMALIZED)) {
+                                qDebug() << "invoking with matchingNode" << matchingNode;
+                                success = metaMethod.invoke(listener.first,
+                                        Q_ARG(QSharedPointer<NLPacket>, QSharedPointer<NLPacket>(packet.release())),
+                                        Q_ARG(QSharedPointer<Node>, matchingNode));
 
                             } else {
                                 success = metaMethod.invoke(listener.first,
@@ -257,13 +266,15 @@ void PacketReceiver::processDatagrams() {
                         }
 
                         if (!success) {
-                            qDebug() << "Error delivering packet " << nameForPacketType(packet->getType()) << " to listener: "
-                                << listener.first->objectName() << "::" << listener.second.name();
+                            qDebug().nospace() << "Error delivering packet " << packetType
+                                << " (" << qPrintable(nameForPacketType(packetType)) << ") to listener "
+                                << listener.first << "::" << qPrintable(listener.second.methodSignature());
                         }
 
                     } else {
                         // we have a dead listener - remove this mapping from the _packetListenerMap
-                        qDebug() << "Listener for packet type" << nameForPacketType(packet->getType())
+                        qDebug() << "Listener for packet type" << packet->getType() << "("
+                            << qPrintable(nameForPacketType(packet->getType())) << ")"
                             << "has been destroyed - removing mapping.";
                         _packetListenerMap.erase(it);
                     }
diff --git a/libraries/networking/src/udt/Packet.cpp b/libraries/networking/src/udt/Packet.cpp
index 55c51d7665..f96de7a20b 100644
--- a/libraries/networking/src/udt/Packet.cpp
+++ b/libraries/networking/src/udt/Packet.cpp
@@ -192,7 +192,7 @@ void Packet::writeSequenceNumber(SequenceNumber seqNum) {
 static const qint64 PACKET_WRITE_ERROR = -1;
 qint64 Packet::writeData(const char* data, qint64 maxSize) {
     // make sure we have the space required to write this block
-    if (maxSize <= bytesAvailable()) {
+    if (maxSize <= bytesAvailableForWrite()) {
         qint64 currentPos = pos();
 
         // good to go - write the data
@@ -202,7 +202,7 @@ qint64 Packet::writeData(const char* data, qint64 maxSize) {
         seek(currentPos + maxSize);
 
         // keep track of _sizeUsed so we can just write the actual data when packet is about to be sent
-        _sizeUsed = std::max(pos() + 1, _sizeUsed);
+        _sizeUsed = std::max(pos(), _sizeUsed);
 
         // return the number of bytes written
         return maxSize;
diff --git a/libraries/networking/src/udt/Packet.h b/libraries/networking/src/udt/Packet.h
index 3d64c814aa..1e18dde117 100644
--- a/libraries/networking/src/udt/Packet.h
+++ b/libraries/networking/src/udt/Packet.h
@@ -49,10 +49,12 @@ public:
     
     PacketVersion getVersion() const { return _version; }
     
-    qint64 getSizeWithHeader() const { return localHeaderSize() + getSizeUsed(); }
+    qint64 getSizeWithHeader() const { return totalHeadersSize() + getSizeUsed(); }
     qint64 getSizeUsed() const { return _sizeUsed; }
     void setSizeUsed(qint64 sizeUsed) { _sizeUsed = sizeUsed; }
 
+    qint64 bytesAvailableForWrite() const { return _capacity - _sizeUsed; }
+
     HifiSockAddr& getSenderSockAddr() { return _senderSockAddr; }
     const HifiSockAddr& getSenderSockAddr() const { return _senderSockAddr; }
 
diff --git a/libraries/networking/src/udt/PacketHeaders.cpp b/libraries/networking/src/udt/PacketHeaders.cpp
index 0085a0e64d..211677f6a6 100644
--- a/libraries/networking/src/udt/PacketHeaders.cpp
+++ b/libraries/networking/src/udt/PacketHeaders.cpp
@@ -18,7 +18,6 @@
 using namespace PacketType;
 
 const QSet<PacketType::Value> NON_VERIFIED_PACKETS = QSet<PacketType::Value>()
-    << CreateAssignment << RequestAssignment << StunResponse
     << NodeJsonStats << EntityQuery
     << OctreeDataNack << EntityEditNack
     << DomainListRequest
@@ -28,6 +27,7 @@ const QSet<PacketType::Value> NON_VERIFIED_PACKETS = QSet<PacketType::Value>()
 const QSet<PacketType::Value> SEQUENCE_NUMBERED_PACKETS = QSet<PacketType::Value>() << AvatarData;
 
 const QSet<PacketType::Value> NON_SOURCED_PACKETS = QSet<PacketType::Value>()
+    << StunResponse << CreateAssignment << RequestAssignment
     << DomainServerRequireDTLS << DomainConnectRequest
     << DomainList << DomainConnectionDenied
     << DomainServerPathQuery << DomainServerPathResponse
diff --git a/libraries/networking/src/udt/PacketList.cpp b/libraries/networking/src/udt/PacketList.cpp
index 43e0b2a4ea..e48ffa0f69 100644
--- a/libraries/networking/src/udt/PacketList.cpp
+++ b/libraries/networking/src/udt/PacketList.cpp
@@ -15,7 +15,10 @@
 
 #include "Packet.h"
 
-PacketList::PacketList(PacketType::Value packetType) : _packetType(packetType) {
+PacketList::PacketList(PacketType::Value packetType) :
+    _packetType(packetType)
+{
+    QIODevice::open(WriteOnly);
 }
 
 void PacketList::startSegment() {