diff --git a/consensus/parlia/parlia.go b/consensus/parlia/parlia.go
index b660217c17..8e791fe1fd 100644
--- a/consensus/parlia/parlia.go
+++ b/consensus/parlia/parlia.go
@@ -144,7 +144,9 @@ var (
 	errBlockHashInconsistent = errors.New("the block hash is inconsistent")
 
 	// errUnauthorizedValidator is returned if a header is signed by a non-authorized entity.
-	errUnauthorizedValidator = errors.New("unauthorized validator")
+	errUnauthorizedValidator = func(val string) error {
+		return errors.New("unauthorized validator: " + val)
+	}
 
 	// errCoinBaseMisMatch is returned if a header's coinbase do not match with signature
 	errCoinBaseMisMatch = errors.New("coinbase do not match with signature")
@@ -752,7 +754,7 @@ func (p *Parlia) verifySeal(chain consensus.ChainHeaderReader, header *types.Hea
 	}
 
 	if _, ok := snap.Validators[signer]; !ok {
-		return errUnauthorizedValidator
+		return errUnauthorizedValidator(signer.String())
 	}
 
 	if snap.SignRecently(signer) {
@@ -1298,7 +1300,7 @@ func (p *Parlia) Seal(chain consensus.ChainHeaderReader, block *types.Block, res
 
 	// Bail out if we're unauthorized to sign a block
 	if _, authorized := snap.Validators[val]; !authorized {
-		return errUnauthorizedValidator
+		return errUnauthorizedValidator(val.String())
 	}
 
 	// If we're amongst the recent signers, wait for the next block
@@ -1408,7 +1410,7 @@ func (p *Parlia) SignRecently(chain consensus.ChainReader, parent *types.Block)
 
 	// Bail out if we're unauthorized to sign a block
 	if _, authorized := snap.Validators[p.val]; !authorized {
-		return true, errUnauthorizedValidator
+		return true, errUnauthorizedValidator(p.val.String())
 	}
 
 	return snap.SignRecently(p.val), nil
@@ -1864,7 +1866,7 @@ func (p *Parlia) backOffTime(snap *Snapshot, header *types.Header, val common.Ad
 			}
 		}
 		if idx < 0 {
-			log.Info("The validator is not authorized", "addr", val)
+			log.Debug("The validator is not authorized", "addr", val)
 			return 0
 		}
 
diff --git a/consensus/parlia/snapshot.go b/consensus/parlia/snapshot.go
index 74dd983be5..b34efed24f 100644
--- a/consensus/parlia/snapshot.go
+++ b/consensus/parlia/snapshot.go
@@ -256,7 +256,7 @@ func (s *Snapshot) apply(headers []*types.Header, chain consensus.ChainHeaderRea
 			return nil, err
 		}
 		if _, ok := snap.Validators[validator]; !ok {
-			return nil, errUnauthorizedValidator
+			return nil, errUnauthorizedValidator(validator.String())
 		}
 		for _, recent := range snap.Recents {
 			if recent == validator {
diff --git a/core/rawdb/chain_iterator.go b/core/rawdb/chain_iterator.go
index 13e684a69c..7974210895 100644
--- a/core/rawdb/chain_iterator.go
+++ b/core/rawdb/chain_iterator.go
@@ -348,7 +348,7 @@ func unindexTransactions(db ethdb.Database, from uint64, to uint64, interrupt ch
 	case <-interrupt:
 		log.Debug("Transaction unindexing interrupted", "blocks", blocks, "txs", txs, "tail", to, "elapsed", common.PrettyDuration(time.Since(start)))
 	default:
-		log.Info("Unindexed transactions", "blocks", blocks, "txs", txs, "tail", to, "elapsed", common.PrettyDuration(time.Since(start)))
+		log.Debug("Unindexed transactions", "blocks", blocks, "txs", txs, "tail", to, "elapsed", common.PrettyDuration(time.Since(start)))
 	}
 }
 
diff --git a/miner/worker.go b/miner/worker.go
index 9f4cce2988..e4a3e5a4ff 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -419,7 +419,7 @@ func (w *worker) newWorkLoop(recommit time.Duration) {
 			if p, ok := w.engine.(*parlia.Parlia); ok {
 				signedRecent, err := p.SignRecently(w.chain, head.Block)
 				if err != nil {
-					log.Info("Not allowed to propose block", "err", err)
+					log.Debug("Not allowed to propose block", "err", err)
 					continue
 				}
 				if signedRecent {