diff --git a/libp2p/NodeTable.cpp b/libp2p/NodeTable.cpp
index c3215da71..e926356b7 100644
--- a/libp2p/NodeTable.cpp
+++ b/libp2p/NodeTable.cpp
@@ -81,7 +81,8 @@ shared_ptr<NodeEntry> NodeTable::addNode(Node const& _node, NodeRelation _relati
 	{
 		shared_ptr<NodeEntry> ret(new NodeEntry(m_node, _node.id, _node.endpoint));
 		ret->pending = false;
-		m_nodes[_node.id] = ret;
+		DEV_GUARDED(x_nodes)
+			m_nodes[_node.id] = ret;
 		noteActiveNode(_node.id, _node.endpoint);
 		return ret;
 	}
@@ -101,14 +102,13 @@ shared_ptr<NodeEntry> NodeTable::addNode(Node const& _node, NodeRelation _relati
 		return move(shared_ptr<NodeEntry>());
 	}
 	
-	{
-		Guard ln(x_nodes);
+	DEV_GUARDED(x_nodes)
 		if (m_nodes.count(_node.id))
 			return m_nodes[_node.id];
-	}
 	
 	shared_ptr<NodeEntry> ret(new NodeEntry(m_node, _node.id, _node.endpoint));
-	m_nodes[_node.id] = ret;
+	DEV_GUARDED(x_nodes)
+		m_nodes[_node.id] = ret;
 	clog(NodeTableConnect) << "addNode pending for" << _node.endpoint;
 	ping(_node.endpoint);
 	return ret;
@@ -186,7 +186,8 @@ void NodeTable::discover(NodeId _node, unsigned _round, shared_ptr<set<shared_pt
 			tried.push_back(r);
 			FindNode p(r->endpoint, _node);
 			p.sign(m_secret);
-			m_findNodeTimeout.push_back(make_pair(r->id, chrono::steady_clock::now()));
+			DEV_GUARDED(x_findNodeTimeout)
+				m_findNodeTimeout.push_back(make_pair(r->id, chrono::steady_clock::now()));
 			m_socketPointer->send(p);
 		}
 	
@@ -447,17 +448,17 @@ void NodeTable::onReceived(UDPSocketFace*, bi::udp::endpoint const& _from, bytes
 				{
 					if (auto n = nodeEntry(nodeid))
 						n->pending = false;
-					else if (m_pubkDiscoverPings.count(_from.address()))
+					else
 					{
+						DEV_GUARDED(x_pubkDiscoverPings)
 						{
-							Guard l(x_pubkDiscoverPings);
+							if (!m_pubkDiscoverPings.count(_from.address()))
+								return; // unsolicited pong; don't note node as active
 							m_pubkDiscoverPings.erase(_from.address());
 						}
 						if (!haveNode(nodeid))
 							addNode(Node(nodeid, NodeIPEndpoint(_from.address(), _from.port(), _from.port())));
 					}
-					else
-						return; // unsolicited pong; don't note node as active
 				}
 				
 				// update our endpoint address and UDP port
@@ -473,14 +474,15 @@ void NodeTable::onReceived(UDPSocketFace*, bi::udp::endpoint const& _from, bytes
 			{
 				bool expected = false;
 				auto now = chrono::steady_clock::now();
-				m_findNodeTimeout.remove_if([&](NodeIdTimePoint const& t)
-				{
-					if (t.first == nodeid && now - t.second < c_reqTimeout)
-						expected = true;
-					else if (t.first == nodeid)
-						return true;
-					return false;
-				});
+				DEV_GUARDED(x_findNodeTimeout)
+					m_findNodeTimeout.remove_if([&](NodeIdTimePoint const& t)
+					{
+						if (t.first == nodeid && now - t.second < c_reqTimeout)
+							expected = true;
+						else if (t.first == nodeid)
+							return true;
+						return false;
+					});
 				
 				if (!expected)
 				{
diff --git a/libp2p/UDP.cpp b/libp2p/UDP.cpp
index eeb3a0b1a..9f89d9ad0 100644
--- a/libp2p/UDP.cpp
+++ b/libp2p/UDP.cpp
@@ -20,9 +20,13 @@
  */
 
 #include "UDP.h"
+using namespace std;
 using namespace dev;
 using namespace dev::p2p;
 
+const char* RLPXWarn::name() { return "!X!"; }
+const char* RLPXNote::name() { return "-X-"; }
+
 h256 RLPXDatagramFace::sign(Secret const& _k)
 {
 	assert(packetType());
diff --git a/libp2p/UDP.h b/libp2p/UDP.h
index f6a4842a9..b09d556e7 100644
--- a/libp2p/UDP.h
+++ b/libp2p/UDP.h
@@ -30,6 +30,7 @@
 #include <libdevcore/Guards.h>
 #include <libdevcrypto/Common.h>
 #include <libdevcrypto/SHA3.h>
+#include <libdevcore/Log.h>
 #include <libdevcore/RLP.h>
 #include "Common.h"
 namespace ba = boost::asio;
@@ -40,6 +41,9 @@ namespace dev
 namespace p2p
 {
 
+struct RLPXWarn: public LogChannel { static const char* name(); static const int verbosity = 0; };
+struct RLPXNote: public LogChannel { static const char* name(); static const int verbosity = 1; };
+
 /**
  * UDP Datagram
  * @todo make data protected/functional
@@ -203,14 +207,14 @@ void UDPSocket<Handler, MaxDatagramSize>::doRead()
 	auto self(UDPSocket<Handler, MaxDatagramSize>::shared_from_this());
 	m_socket.async_receive_from(boost::asio::buffer(m_recvData), m_recvEndpoint, [this, self](boost::system::error_code _ec, size_t _len)
 	{
-		// ASIO Safety: It is possible that ASIO will call lambda w/o an error
-		// and after the socket has been disconnected. Checking m_closed
-		// guarantees that m_host will not be called after disconnect().
-		if (_ec || m_closed)
+		if (m_closed)
 			return disconnectWithError(_ec);
+		
+		if (_ec != boost::system::errc::success)
+			clog(NetWarn) << "Receiving UDP message failed. " << _ec.value() << ":" << _ec.message();
 
-		assert(_len);
-		m_host.onReceived(this, m_recvEndpoint, bytesConstRef(m_recvData.data(), _len));
+		if (_len)
+			m_host.onReceived(this, m_recvEndpoint, bytesConstRef(m_recvData.data(), _len));
 		doRead();
 	});
 }
@@ -228,17 +232,14 @@ void UDPSocket<Handler, MaxDatagramSize>::doWrite()
 	{
 		if (m_closed)
 			return disconnectWithError(_ec);
-		else if (_ec != boost::system::errc::success &&
-				_ec != boost::system::errc::address_not_available &&
-				_ec != boost::system::errc::host_unreachable)
-			return disconnectWithError(_ec);
-		else
-		{
-			Guard l(x_sendQ);
-			m_sendQ.pop_front();
-			if (m_sendQ.empty())
-				return;
-		}
+		
+		if (_ec != boost::system::errc::success)
+			clog(NetWarn) << "Failed delivering UDP message. " << _ec.value() << ":" << _ec.message();
+		
+		Guard l(x_sendQ);
+		m_sendQ.pop_front();
+		if (m_sendQ.empty())
+			return;
 		doWrite();
 	});
 }