diff --git a/src/main.cpp b/src/main.cpp
index 22baf0f3e..bde7b5acd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4750,3 +4750,29 @@ uint64 CTxOutCompressor::DecompressAmount(uint64 x)
     }
     return n;
 }
+
+
+class CMainCleanup
+{
+public:
+    CMainCleanup() {}
+    ~CMainCleanup() {
+        // block headers
+        std::map<uint256, CBlockIndex*>::iterator it1 = mapBlockIndex.begin();
+        for (; it1 != mapBlockIndex.end(); it1++)
+            delete (*it1).second;
+        mapBlockIndex.clear();
+
+        // orphan blocks
+        std::map<uint256, CBlock*>::iterator it2 = mapOrphanBlocks.begin();
+        for (; it2 != mapOrphanBlocks.end(); it2++)
+            delete (*it2).second;
+        mapOrphanBlocks.clear();
+
+        // orphan transactions
+        std::map<uint256, CDataStream*>::iterator it3 = mapOrphanTransactions.begin();
+        for (; it3 != mapOrphanTransactions.end(); it3++)
+            delete (*it3).second;
+        mapOrphanTransactions.clear();
+    }
+} instance_of_cmaincleanup;
diff --git a/src/net.cpp b/src/net.cpp
index 3406a28b0..ed2e662fd 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -660,12 +660,12 @@ void ThreadSocketHandler(void* parg)
     printf("ThreadSocketHandler exited\n");
 }
 
+static list<CNode*> vNodesDisconnected;
+
 void ThreadSocketHandler2(void* parg)
 {
     printf("ThreadSocketHandler started\n");
-    list<CNode*> vNodesDisconnected;
     unsigned int nPrevNodeCount = 0;
-
     loop
     {
         //
@@ -1992,6 +1992,7 @@ bool StopNode()
         Sleep(20);
     Sleep(50);
     DumpAddresses();
+
     return true;
 }
 
@@ -2012,6 +2013,18 @@ public:
                 if (closesocket(hListenSocket) == SOCKET_ERROR)
                     printf("closesocket(hListenSocket) failed with error %d\n", WSAGetLastError());
 
+        // clean up some globals (to help leak detection)
+        BOOST_FOREACH(CNode *pnode, vNodes)
+            delete pnode;
+        BOOST_FOREACH(CNode *pnode, vNodesDisconnected)
+            delete pnode;
+        vNodes.clear();
+        vNodesDisconnected.clear();
+        delete semOutbound;
+        semOutbound = NULL;
+        delete pnodeLocalHost;
+        pnodeLocalHost = NULL;
+
 #ifdef WIN32
         // Shutdown Windows Sockets
         WSACleanup();