diff --git a/core/block_processor.go b/core/block_processor.go
index 127e979211..233e5e4db3 100644
--- a/core/block_processor.go
+++ b/core/block_processor.go
@@ -264,6 +264,7 @@ func (sm *BlockProcessor) ValidateBlock(block, parent *types.Block) error {
 
 	expd := CalcDifficulty(block, parent)
 	if expd.Cmp(block.Header().Difficulty) < 0 {
+		fmt.Println("parent\n", parent)
 		return fmt.Errorf("Difficulty check failed for block %v, %v", block.Header().Difficulty, expd)
 	}
 
diff --git a/core/chain_manager.go b/core/chain_manager.go
index 82b17cd931..e73ea63788 100644
--- a/core/chain_manager.go
+++ b/core/chain_manager.go
@@ -25,7 +25,7 @@ func CalcDifficulty(block, parent *types.Block) *big.Int {
 
 	bh, ph := block.Header(), parent.Header()
 	adjust := new(big.Int).Rsh(ph.Difficulty, 10)
-	if bh.Time >= ph.Time+5 {
+	if bh.Time >= ph.Time+13 {
 		diff.Sub(ph.Difficulty, adjust)
 	} else {
 		diff.Add(ph.Difficulty, adjust)
diff --git a/eth/protocol.go b/eth/protocol.go
index 723ab5502e..736bcd94bb 100644
--- a/eth/protocol.go
+++ b/eth/protocol.go
@@ -122,7 +122,7 @@ func (self *ethProtocol) handle() error {
 	defer msg.Discard()
 
 	switch msg.Code {
-
+	case GetTxMsg: // ignore
 	case StatusMsg:
 		return self.protoError(ErrExtraStatusMsg, "")