diff --git a/whisper/whisperv5/filter.go b/whisper/whisperv5/filter.go
index 091a31cc9e..889201e33e 100644
--- a/whisper/whisperv5/filter.go
+++ b/whisper/whisperv5/filter.go
@@ -21,6 +21,7 @@ import (
 	"sync"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/logger/glog"
 )
 
 type Filter struct {
@@ -82,8 +83,9 @@ func (fs *Filters) NotifyWatchers(env *Envelope, messageCode uint64) {
 
 	fs.mutex.RLock()
 	var msg *ReceivedMessage
-	for _, watcher := range fs.watchers {
+	for j, watcher := range fs.watchers {
 		if messageCode == p2pCode && !watcher.AcceptP2P {
+			glog.V(9).Infof("msg [%x], filter [%d]: p2p messages are not allowed \n", env.Hash(), j)
 			continue
 		}
 
@@ -94,6 +96,11 @@ func (fs *Filters) NotifyWatchers(env *Envelope, messageCode uint64) {
 			match = watcher.MatchEnvelope(env)
 			if match {
 				msg = env.Open(watcher)
+				if msg == nil {
+					glog.V(9).Infof("msg [%x], filter [%d]: failed to open \n", env.Hash(), j)
+				}
+			} else {
+				glog.V(9).Infof("msg [%x], filter [%d]: does not match \n", env.Hash(), j)
 			}
 		}
 
@@ -141,12 +148,12 @@ func (f *Filter) MatchMessage(msg *ReceivedMessage) bool {
 	if f.PoW > 0 && msg.PoW < f.PoW {
 		return false
 	}
-	if f.Src != nil && !isPubKeyEqual(msg.Src, f.Src) {
+	if f.Src != nil && !IsPubKeyEqual(msg.Src, f.Src) {
 		return false
 	}
 
 	if f.expectsAsymmetricEncryption() && msg.isAsymmetricEncryption() {
-		return isPubKeyEqual(&f.KeyAsym.PublicKey, msg.Dst) && f.MatchTopic(msg.Topic)
+		return IsPubKeyEqual(&f.KeyAsym.PublicKey, msg.Dst) && f.MatchTopic(msg.Topic)
 	} else if f.expectsSymmetricEncryption() && msg.isSymmetricEncryption() {
 		return f.SymKeyHash == msg.SymKeyHash && f.MatchTopic(msg.Topic)
 	}
@@ -180,7 +187,7 @@ func (f *Filter) MatchTopic(topic TopicType) bool {
 	return false
 }
 
-func isPubKeyEqual(a, b *ecdsa.PublicKey) bool {
+func IsPubKeyEqual(a, b *ecdsa.PublicKey) bool {
 	if !ValidatePublicKey(a) {
 		return false
 	} else if !ValidatePublicKey(b) {
diff --git a/whisper/whisperv5/filter_test.go b/whisper/whisperv5/filter_test.go
index 561bb8f7d6..bfa45782a0 100644
--- a/whisper/whisperv5/filter_test.go
+++ b/whisper/whisperv5/filter_test.go
@@ -139,7 +139,7 @@ func TestComparePubKey(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to generate second key with seed %d: %s.", seed, err)
 	}
-	if isPubKeyEqual(&key1.PublicKey, &key2.PublicKey) {
+	if IsPubKeyEqual(&key1.PublicKey, &key2.PublicKey) {
 		t.Fatalf("public keys are equal, seed %d.", seed)
 	}
 
@@ -149,7 +149,7 @@ func TestComparePubKey(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to generate third key with seed %d: %s.", seed, err)
 	}
-	if isPubKeyEqual(&key1.PublicKey, &key3.PublicKey) {
+	if IsPubKeyEqual(&key1.PublicKey, &key3.PublicKey) {
 		t.Fatalf("key1 == key3, seed %d.", seed)
 	}
 }
diff --git a/whisper/whisperv5/message_test.go b/whisper/whisperv5/message_test.go
index 394291a837..5cbc9182f2 100644
--- a/whisper/whisperv5/message_test.go
+++ b/whisper/whisperv5/message_test.go
@@ -116,7 +116,7 @@ func singleMessageTest(t *testing.T, symmetric bool) {
 	if len(decrypted.Signature) != signatureLength {
 		t.Fatalf("failed with seed %d: signature len %d.", seed, len(decrypted.Signature))
 	}
-	if !isPubKeyEqual(decrypted.Src, &params.Src.PublicKey) {
+	if !IsPubKeyEqual(decrypted.Src, &params.Src.PublicKey) {
 		t.Fatalf("failed with seed %d: signature mismatch.", seed)
 	}
 }
@@ -268,7 +268,7 @@ func singleEnvelopeOpenTest(t *testing.T, symmetric bool) {
 	if len(decrypted.Signature) != signatureLength {
 		t.Fatalf("failed with seed %d: signature len %d.", seed, len(decrypted.Signature))
 	}
-	if !isPubKeyEqual(decrypted.Src, &params.Src.PublicKey) {
+	if !IsPubKeyEqual(decrypted.Src, &params.Src.PublicKey) {
 		t.Fatalf("failed with seed %d: signature mismatch.", seed)
 	}
 	if decrypted.isAsymmetricEncryption() == symmetric {
@@ -281,7 +281,7 @@ func singleEnvelopeOpenTest(t *testing.T, symmetric bool) {
 		if decrypted.Dst == nil {
 			t.Fatalf("failed with seed %d: dst is nil.", seed)
 		}
-		if !isPubKeyEqual(decrypted.Dst, &key.PublicKey) {
+		if !IsPubKeyEqual(decrypted.Dst, &key.PublicKey) {
 			t.Fatalf("failed with seed %d: Dst.", seed)
 		}
 	}