diff --git a/operator/rpc_client.go b/operator/rpc_client.go
index 7b2bfb1..90c531c 100644
--- a/operator/rpc_client.go
+++ b/operator/rpc_client.go
@@ -1,7 +1,10 @@
 package operator
 
 import (
+	"crypto/tls"
 	"fmt"
+	"io"
+	"net"
 	"net/rpc"
 	"strings"
 	"time"
@@ -48,13 +51,19 @@ func NewAggregatorRpcClient(config config.NodeConfig, operatorId sdktypes.Operat
 	}, nil
 }
 
-func (c *AggregatorRpcClient) dialAggregatorRpcClient() error {
-	client, err := rpc.DialHTTP("tcp", c.aggregatorIpPortAddr)
+func (c *AggregatorRpcClient) dialAggregatorRpcClient() (err error) {
+	var conn io.ReadWriteCloser
+	conn, err = tls.Dial("tcp", c.aggregatorIpPortAddr, &tls.Config{})
 	if err != nil {
-		return err
+		if _, ok := err.(tls.RecordHeaderError); !ok {
+			return err
+		}
+		// retry connect without tls
+		conn, err = net.Dial("tcp", c.aggregatorIpPortAddr)
 	}
+	client := rpc.NewClient(conn)
 	c.rpcClient = client
-	return nil
+	return
 }
 
 // CreateAlertTaskToAggregator create a new alert task, if had existing, just return current alert task.
@@ -78,7 +87,7 @@ func (c *AggregatorRpcClient) InitOperatorToAggregator() error {
 		RegistryCoordinatorAddr:    c.RegistryCoordinatorAddr,
 	}
 
-	c.logger.Info("Create task header to aggregator", "req", fmt.Sprintf("%#v", req))
+	c.logger.Info("Init operator to aggregator", "req", fmt.Sprintf("%#v", req))
 
 	for i := 0; i < 5; i++ {
 		err := c.rpcClient.Call("Aggregator.InitOperator", req, &reply)
@@ -125,7 +134,7 @@ func (c *AggregatorRpcClient) CreateAlertTaskToAggregator(alertHash [32]byte) (*
 		AlertHash: alertHash,
 	}
 
-	c.logger.Info("Create task header to aggregator", "req", fmt.Sprintf("%#v", req))
+	c.logger.Info("Create task to aggregator", "req", fmt.Sprintf("%#v", req))
 
 	for i := 0; i < 5; i++ {
 		err := c.rpcClient.Call("Aggregator.CreateTask", req, &reply)
@@ -135,16 +144,16 @@ func (c *AggregatorRpcClient) CreateAlertTaskToAggregator(alertHash [32]byte) (*
 				return nil, err
 			}
 		} else {
-			c.logger.Info("create task response header accepted by aggregator.", "reply", reply)
+			c.logger.Info("create task accepted by aggregator.", "reply", reply)
 			c.metrics.IncNumTasksAcceptedByAggregator()
 			return &reply.Info, nil
 		}
 		c.logger.Infof("Retrying in 2 seconds")
 		time.Sleep(2 * time.Second)
 	}
-	c.logger.Errorf("Could not send signed task response to aggregator. Tried 5 times.")
+	c.logger.Errorf("Could not create task to aggregator. Tried 5 times.")
 
-	return nil, fmt.Errorf("Could not send signed task response to aggregator")
+	return nil, fmt.Errorf("Could not create task to aggregator")
 }
 
 // SendSignedTaskResponseToAggregator sends a signed task response to the aggregator.