diff --git a/libp2p/Host.cpp b/libp2p/Host.cpp
index 05fa81f4c..b509ecc2a 100644
--- a/libp2p/Host.cpp
+++ b/libp2p/Host.cpp
@@ -182,6 +182,7 @@ void Host::disconnectPeers()
 	}
 
 	delete m_upnp;
+	m_upnp = nullptr;
 }
 
 void Host::seal(bytes& _b)
@@ -210,7 +211,10 @@ void Host::determinePublic(string const& _publicAddress, bool _upnp)
 	if (m_upnp && m_upnp->isValid() && m_peerAddresses.size())
 	{
 		clog(NetNote) << "External addr:" << m_upnp->externalIP();
-		int p = m_upnp->addRedirect(m_peerAddresses[0].to_string().c_str(), m_listenPort);
+		int p;
+		for (auto const& addr : m_peerAddresses)
+			if ((p = m_upnp->addRedirect(addr.to_string().c_str(), m_listenPort)))
+				break;
 		if (p)
 			clog(NetNote) << "Punched through NAT and mapped local port" << m_listenPort << "onto external port" << p << ".";
 		else
diff --git a/libp2p/UPnP.cpp b/libp2p/UPnP.cpp
index 211b185bb..42868d67a 100644
--- a/libp2p/UPnP.cpp
+++ b/libp2p/UPnP.cpp
@@ -123,16 +123,18 @@ int UPnP::addRedirect(char const* _addr, int _port)
 
 	// Try direct mapping first (port external, port internal).
 	char port_str[16];
+	char ext_port_str[16];
 	sprintf(port_str, "%d", _port);
 	if (!UPNP_AddPortMapping(m_urls->controlURL, m_data->first.servicetype, port_str, port_str, _addr, "ethereum", "TCP", NULL, NULL))
 		return _port;
 
 	// Failed - now try (random external, port internal) and cycle up to 10 times.
+	srand(time(NULL));
 	for (unsigned i = 0; i < 10; ++i)
 	{
-		_port = rand() % 65535 - 1024 + 1024;
-		sprintf(port_str, "%d", _port);
-		if (!UPNP_AddPortMapping(m_urls->controlURL, m_data->first.servicetype, NULL, port_str, _addr, "ethereum", "TCP", NULL, NULL))
+		_port = rand() % (65535 - 1024) + 1024;
+		sprintf(ext_port_str, "%d", _port);
+		if (!UPNP_AddPortMapping(m_urls->controlURL, m_data->first.servicetype, ext_port_str, port_str, _addr, "ethereum", "TCP", NULL, NULL))
 			return _port;
 	}
 
diff --git a/windows/LibEthereum.props b/windows/LibEthereum.props
index 136a8edab..8c0bcac90 100644
--- a/windows/LibEthereum.props
+++ b/windows/LibEthereum.props
@@ -15,7 +15,7 @@
       <TreatWarningAsError>true</TreatWarningAsError>
       <MinimalRebuild>false</MinimalRebuild>
       <AdditionalIncludeDirectories>include/$(ProjectName);$(IntDir);../../cryptopp;..;../libethcore;../libethereum;../libethsupport;$(BoostDir);../../leveldb/include;../secp256k1;../../miniupnp</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>ETH_BUILD_PLATFORM=Windows/VS2013;ETH_BUILD_TYPE=$(Configuration)-$(Platform);STATICLIB;LEVELDB_PLATFORM_WINDOWS;USE_NUM_BOOST;USE_FIELD_10X26;USE_FIELD_INV_BUILTIN;_WIN32_WINNT=0x0501;WIN32;_CRT_SECURE_NO_WARNINGS;_SCL_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>ETH_BUILD_PLATFORM=Windows/VS2013;ETH_BUILD_TYPE=$(Configuration)-$(Platform);ETH_MINIUPNPC=1;STATICLIB;LEVELDB_PLATFORM_WINDOWS;USE_NUM_BOOST;USE_FIELD_10X26;USE_FIELD_INV_BUILTIN;_WIN32_WINNT=0x0501;WIN32;_CRT_SECURE_NO_WARNINGS;_SCL_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <WarningLevel>Level3</WarningLevel>