diff --git a/services/opentsdb/service.go b/services/opentsdb/service.go
index 5301a4e864..dba6800a5f 100644
--- a/services/opentsdb/service.go
+++ b/services/opentsdb/service.go
@@ -32,6 +32,10 @@ const (
 	statTelnetPointsReceived     = "tl_points_rx"
 	statTelnetBytesReceived      = "tl_bytes_rx"
 	statTelnetReadError          = "tl_read_err"
+	statTelnetBadLine            = "tl_bad_line"
+	statTelnetBadTime            = "tl_bad_time"
+	statTelnetBadTag             = "tl_bad_tag"
+	statTelnetBadFloat           = "tl_bad_float"
 	statBatchesTrasmitted        = "batches_tx"
 	statPointsTransmitted        = "points_tx"
 	statBatchesTransmitFail      = "batches_tx_fail"
@@ -207,6 +211,10 @@ func (s *Service) serve() {
 
 // handleConn processes conn. This is run in a separate goroutine.
 func (s *Service) handleConn(conn net.Conn) {
+	defer s.statMap.Add(statConnectionsActive, -1)
+	s.statMap.Add(statConnectionsActive, 1)
+	s.statMap.Add(statConnectionsHandled, 1)
+
 	// Read header into buffer to check if it's HTTP.
 	var buf bytes.Buffer
 	r := bufio.NewReader(io.TeeReader(conn, &buf))
@@ -240,6 +248,9 @@ func (s *Service) handleTelnetConn(conn net.Conn) {
 	s.statMap.Add(statTelnetConnectionsActive, 1)
 	s.statMap.Add(statTelnetConnectionsHandled, 1)
 
+	// Get connection details.
+	remoteAddr := conn.RemoteAddr().String()
+
 	// Wrap connection in a text protocol reader.
 	r := textproto.NewReader(bufio.NewReader(conn))
 	for {
@@ -262,7 +273,8 @@ func (s *Service) handleTelnetConn(conn net.Conn) {
 		}
 
 		if len(inputStrs) < 4 || inputStrs[0] != "put" {
-			s.Logger.Println("TSDBServer: malformed line, skipping: ", line)
+			s.statMap.Add(statTelnetBadLine, 1)
+			s.Logger.Printf("malformed line '%s' from %s", line, remoteAddr)
 			continue
 		}
 
@@ -274,7 +286,8 @@ func (s *Service) handleTelnetConn(conn net.Conn) {
 		var t time.Time
 		ts, err := strconv.ParseInt(tsStr, 10, 64)
 		if err != nil {
-			s.Logger.Println("TSDBServer: malformed time, skipping: ", tsStr)
+			s.statMap.Add(statTelnetBadTime, 1)
+			s.Logger.Printf("malformed time '%s' from %s", tsStr, remoteAddr)
 		}
 
 		switch len(tsStr) {
@@ -285,7 +298,8 @@ func (s *Service) handleTelnetConn(conn net.Conn) {
 			t = time.Unix(ts/1000, (ts%1000)*1000)
 			break
 		default:
-			s.Logger.Println("TSDBServer: time must be 10 or 13 chars, skipping: ", tsStr)
+			s.statMap.Add(statTelnetBadTime, 1)
+			s.Logger.Printf("bad time '%s' must be 10 or 13 chars, from %s ", tsStr, remoteAddr)
 			continue
 		}
 
@@ -293,7 +307,8 @@ func (s *Service) handleTelnetConn(conn net.Conn) {
 		for t := range tagStrs {
 			parts := strings.SplitN(tagStrs[t], "=", 2)
 			if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
-				s.Logger.Println("TSDBServer: malformed tag data", tagStrs[t])
+				s.statMap.Add(statTelnetBadTag, 1)
+				s.Logger.Printf("malformed tag data '%v' from %s", tagStrs[t], remoteAddr)
 				continue
 			}
 			k := parts[0]
@@ -304,7 +319,8 @@ func (s *Service) handleTelnetConn(conn net.Conn) {
 		fields := make(map[string]interface{})
 		fields["value"], err = strconv.ParseFloat(valueStr, 64)
 		if err != nil {
-			s.Logger.Println("TSDBServer: could not parse value as float: ", valueStr)
+			s.statMap.Add(statTelnetBadFloat, 1)
+			s.Logger.Printf("bad float '%s' from %s", valueStr, remoteAddr)
 			continue
 		}