diff --git a/src/main.cpp b/src/main.cpp
index ceb1e80d2cc..a5a0f031aff 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3234,6 +3234,8 @@ void static ProcessGetData(CNode* pfrom)
 
     vector<CInv> vNotFound;
 
+    LOCK(cs_main);
+
     while (it != pfrom->vRecvGetData.end()) {
         // Don't bother if send buffer is too full to respond anyway
         if (pfrom->nSendSize >= SendBufferSize())
@@ -3406,7 +3408,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 
         pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
 
-        AddTimeData(pfrom->addr, nTime);
 
         // Change version
         pfrom->PushMessage("verack");
@@ -3448,6 +3449,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 
         LogPrintf("receive version message: version %d, blocks=%d, us=%s, them=%s, peer=%s\n", pfrom->nVersion, pfrom->nStartingHeight, addrMe.ToString().c_str(), addrFrom.ToString().c_str(), pfrom->addr.ToString().c_str());
 
+        LOCK(cs_main);
+        AddTimeData(pfrom->addr, nTime);
         cPeerBlockCounts.input(pfrom->nStartingHeight);
     }
 
@@ -3551,6 +3554,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
                 break;
             }
         }
+
+        LOCK(cs_main);
+
         for (unsigned int nInv = 0; nInv < vInv.size(); nInv++)
         {
             const CInv &inv = vInv[nInv];
@@ -3608,6 +3614,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         uint256 hashStop;
         vRecv >> locator >> hashStop;
 
+        LOCK(cs_main);
+
         // Find the last block the caller has in the main chain
         CBlockIndex* pindex = chainActive.FindFork(locator);
 
@@ -3642,6 +3650,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         uint256 hashStop;
         vRecv >> locator >> hashStop;
 
+        LOCK(cs_main);
+
         CBlockIndex* pindex = NULL;
         if (locator.IsNull())
         {
@@ -3683,6 +3693,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         CInv inv(MSG_TX, tx.GetHash());
         pfrom->AddInventoryKnown(inv);
 
+        LOCK(cs_main);
+
         bool fMissingInputs = false;
         CValidationState state;
         if (mempool.accept(state, tx, true, &fMissingInputs))
@@ -3757,6 +3769,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         CInv inv(MSG_BLOCK, block.GetHash());
         pfrom->AddInventoryKnown(inv);
 
+        LOCK(cs_main);
+
         CValidationState state;
         if (ProcessBlock(state, pfrom, &block))
             mapAlreadyAskedFor.erase(inv);
@@ -3778,6 +3792,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 
     else if (strCommand == "mempool")
     {
+        LOCK(cs_main);
+
         std::vector<uint256> vtxid;
         LOCK2(mempool.cs, pfrom->cs_filter);
         mempool.queryHashes(vtxid);
@@ -4043,10 +4059,7 @@ bool ProcessMessages(CNode* pfrom)
         bool fRet = false;
         try
         {
-            {
-                LOCK(cs_main);
-                fRet = ProcessMessage(pfrom, strCommand, vRecv);
-            }
+            fRet = ProcessMessage(pfrom, strCommand, vRecv);
             boost::this_thread::interruption_point();
         }
         catch (std::ios_base::failure& e)
@@ -4089,8 +4102,7 @@ bool ProcessMessages(CNode* pfrom)
 
 bool SendMessages(CNode* pto, bool fSendTrickle)
 {
-    TRY_LOCK(cs_main, lockMain);
-    if (lockMain) {
+    {
         // Don't send anything until we get their version message
         if (pto->nVersion == 0)
             return true;
@@ -4125,20 +4137,6 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
             }
         }
 
-        // Start block sync
-        if (pto->fStartSync && !fImporting && !fReindex) {
-            pto->fStartSync = false;
-            PushGetBlocks(pto, chainActive.Tip(), uint256(0));
-        }
-
-        // Resend wallet transactions that haven't gotten in a block yet
-        // Except during reindex, importing and IBD, when old wallet
-        // transactions become unconfirmed and spams other nodes.
-        if (!fReindex && !fImporting && !IsInitialBlockDownload())
-        {
-            ResendWalletTransactions();
-        }
-
         // Address refresh broadcast
         static int64 nLastRebroadcast;
         if (!IsInitialBlockDownload() && (GetTime() - nLastRebroadcast > 24 * 60 * 60))
@@ -4189,6 +4187,23 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
                 pto->PushMessage("addr", vAddr);
         }
 
+        TRY_LOCK(cs_main, lockMain);
+        if (!lockMain)
+            return true;
+
+        // Start block sync
+        if (pto->fStartSync && !fImporting && !fReindex) {
+            pto->fStartSync = false;
+            PushGetBlocks(pto, chainActive.Tip(), uint256(0));
+        }
+
+        // Resend wallet transactions that haven't gotten in a block yet
+        // Except during reindex, importing and IBD, when old wallet
+        // transactions become unconfirmed and spams other nodes.
+        if (!fReindex && !fImporting && !IsInitialBlockDownload())
+        {
+            ResendWalletTransactions();
+        }
 
         //
         // Message: inventory
diff --git a/src/net.cpp b/src/net.cpp
index e0fb3eea686..dd7bf283a9a 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -801,7 +801,8 @@ void ThreadSocketHandler()
                     vNodesDisconnected.push_back(pnode);
                 }
             }
-
+        }
+        {
             // Delete disconnected nodes
             list<CNode*> vNodesDisconnectedCopy = vNodesDisconnected;
             BOOST_FOREACH(CNode* pnode, vNodesDisconnectedCopy)