diff --git a/weed/operation/grpc_client.go b/weed/operation/grpc_client.go
index ea7a82044..bf4d4bec3 100644
--- a/weed/operation/grpc_client.go
+++ b/weed/operation/grpc_client.go
@@ -44,7 +44,7 @@ func withMasterServerClient(masterServer string, grpcDialOption grpc.DialOption,
 
 	masterGrpcAddress, parseErr := util.ParseServerToGrpcAddress(masterServer)
 	if parseErr != nil {
-		return fmt.Errorf("failed to parse master grpc %v", masterServer)
+		return fmt.Errorf("failed to parse master grpc %v: %v", masterServer, parseErr)
 	}
 
 	return util.WithCachedGrpcClient(ctx, func(grpcConnection *grpc.ClientConn) error {
diff --git a/weed/server/volume_grpc_client_to_master.go b/weed/server/volume_grpc_client_to_master.go
index 7667ed363..a57ab48e7 100644
--- a/weed/server/volume_grpc_client_to_master.go
+++ b/weed/server/volume_grpc_client_to_master.go
@@ -34,7 +34,7 @@ func (vs *VolumeServer) heartbeat() {
 			}
 			masterGrpcAddress, parseErr := util.ParseServerToGrpcAddress(master)
 			if parseErr != nil {
-				glog.V(0).Infof("failed to parse master grpc %v", masterGrpcAddress)
+				glog.V(0).Infof("failed to parse master grpc %v: %v", masterGrpcAddress, parseErr)
 				continue
 			}
 			newLeader, err = vs.doHeartbeat(context.Background(), master, masterGrpcAddress, grpcDialOption, time.Duration(vs.pulseSeconds)*time.Second)
diff --git a/weed/util/grpc_client_server.go b/weed/util/grpc_client_server.go
index a2407eb13..31497ad35 100644
--- a/weed/util/grpc_client_server.go
+++ b/weed/util/grpc_client_server.go
@@ -88,19 +88,19 @@ func WithCachedGrpcClient(ctx context.Context, fn func(*grpc.ClientConn) error,
 }
 
 func ParseServerToGrpcAddress(server string) (serverGrpcAddress string, err error) {
-	hostnameAndPort := strings.Split(server, ":")
-	if len(hostnameAndPort) != 2 {
-		return "", fmt.Errorf("server should have hostname:port format: %v", hostnameAndPort)
+	colonIndex := strings.LastIndex(server, ":")
+	if colonIndex < 0 {
+		return "", fmt.Errorf("server should have hostname:port format: %v", server)
 	}
 
-	port, parseErr := strconv.ParseUint(hostnameAndPort[1], 10, 64)
+	port, parseErr := strconv.ParseUint(server[colonIndex+1:], 10, 64)
 	if parseErr != nil {
 		return "", fmt.Errorf("server port parse error: %v", parseErr)
 	}
 
 	grpcPort := int(port) + 10000
 
-	return fmt.Sprintf("%s:%d", hostnameAndPort[0], grpcPort), nil
+	return fmt.Sprintf("%s:%d", server[:colonIndex], grpcPort), nil
 }
 
 func ServerToGrpcAddress(server string) (serverGrpcAddress string) {
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index 7a0bc9181..fc8d3506b 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -103,7 +103,7 @@ func withMasterClient(ctx context.Context, master string, grpcDialOption grpc.Di
 
 	masterGrpcAddress, parseErr := util.ParseServerToGrpcAddress(master)
 	if parseErr != nil {
-		return fmt.Errorf("failed to parse master grpc %v", master)
+		return fmt.Errorf("failed to parse master grpc %v: %v", master, parseErr)
 	}
 
 	return util.WithCachedGrpcClient(ctx, func(grpcConnection *grpc.ClientConn) error {