diff --git a/agent/pkg/agent/common/common.go b/agent/pkg/agent/common/common.go
new file mode 100644
index 00000000..882226f2
--- /dev/null
+++ b/agent/pkg/agent/common/common.go
@@ -0,0 +1,3 @@
+package common
+
+const CertsDNSName = "godoxy.agent"
diff --git a/agent/pkg/agent/config.go b/agent/pkg/agent/config.go
index f71c9068..5f77eb63 100644
--- a/agent/pkg/agent/config.go
+++ b/agent/pkg/agent/config.go
@@ -18,6 +18,7 @@ import (
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 	"github.com/valyala/fasthttp"
+	"github.com/yusing/godoxy/agent/pkg/agent/common"
 	agentstream "github.com/yusing/godoxy/agent/pkg/agent/stream"
 	"github.com/yusing/godoxy/agent/pkg/certs"
 	gperr "github.com/yusing/goutils/errs"
@@ -64,7 +65,7 @@ const (
 	EndpointLogs       = "/logs"
 	EndpointSystemInfo = "/system_info"
 
-	AgentHost = CertsDNSName
+	AgentHost = common.CertsDNSName
 
 	APIEndpointBase = "/godoxy/agent"
 	APIBaseURL      = "https://" + AgentHost + APIEndpointBase
@@ -133,7 +134,7 @@ func (cfg *AgentConfig) StartWithCerts(ctx context.Context, ca, crt, key []byte)
 	cfg.tlsConfig = tls.Config{
 		Certificates: []tls.Certificate{clientCert},
 		RootCAs:      caCertPool,
-		ServerName:   CertsDNSName,
+		ServerName:   common.CertsDNSName,
 	}
 
 	// create transport and http client
diff --git a/agent/pkg/agent/new_agent.go b/agent/pkg/agent/new_agent.go
index df0af75d..e7145622 100644
--- a/agent/pkg/agent/new_agent.go
+++ b/agent/pkg/agent/new_agent.go
@@ -17,10 +17,8 @@ import (
 	"math/big"
 	"strings"
 	"time"
-)
 
-const (
-	CertsDNSName = "godoxy.agent"
+	"github.com/yusing/godoxy/agent/pkg/agent/common"
 )
 
 func toPEMPair(certDER []byte, key *ecdsa.PrivateKey) *PEMPair {
@@ -156,7 +154,7 @@ func NewAgent() (ca, srv, client *PEMPair, err error) {
 		SerialNumber: caSerialNumber,
 		Subject: pkix.Name{
 			Organization: []string{"GoDoxy"},
-			CommonName:   CertsDNSName,
+			CommonName:   common.CertsDNSName,
 		},
 		NotBefore:             time.Now(),
 		NotAfter:              time.Now().AddDate(1000, 0, 0), // 1000 years
@@ -196,9 +194,9 @@ func NewAgent() (ca, srv, client *PEMPair, err error) {
 		Subject: pkix.Name{
 			Organization:       caTemplate.Subject.Organization,
 			OrganizationalUnit: []string{"Server"},
-			CommonName:         CertsDNSName,
+			CommonName:         common.CertsDNSName,
 		},
-		DNSNames:           []string{CertsDNSName},
+		DNSNames:           []string{common.CertsDNSName},
 		NotBefore:          time.Now(),
 		NotAfter:           time.Now().AddDate(1000, 0, 0), // Add validity period
 		KeyUsage:           x509.KeyUsageDigitalSignature,
@@ -228,9 +226,9 @@ func NewAgent() (ca, srv, client *PEMPair, err error) {
 		Subject: pkix.Name{
 			Organization:       caTemplate.Subject.Organization,
 			OrganizationalUnit: []string{"Client"},
-			CommonName:         CertsDNSName,
+			CommonName:         common.CertsDNSName,
 		},
-		DNSNames:           []string{CertsDNSName},
+		DNSNames:           []string{common.CertsDNSName},
 		NotBefore:          time.Now(),
 		NotAfter:           time.Now().AddDate(1000, 0, 0),
 		KeyUsage:           x509.KeyUsageDigitalSignature,
diff --git a/agent/pkg/agent/new_agent_test.go b/agent/pkg/agent/new_agent_test.go
index 14a34b78..e446f9ae 100644
--- a/agent/pkg/agent/new_agent_test.go
+++ b/agent/pkg/agent/new_agent_test.go
@@ -10,6 +10,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	"github.com/yusing/godoxy/agent/pkg/agent/common"
 )
 
 func TestNewAgent(t *testing.T) {
@@ -72,7 +73,7 @@ func TestServerClient(t *testing.T) {
 	clientTLSConfig := &tls.Config{
 		Certificates: []tls.Certificate{*clientTLS},
 		RootCAs:      caPool,
-		ServerName:   CertsDNSName,
+		ServerName:   common.CertsDNSName,
 	}
 
 	server := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
diff --git a/agent/pkg/agent/stream/tcp_client.go b/agent/pkg/agent/stream/tcp_client.go
index 19419139..8579a526 100644
--- a/agent/pkg/agent/stream/tcp_client.go
+++ b/agent/pkg/agent/stream/tcp_client.go
@@ -5,6 +5,8 @@ import (
 	"crypto/x509"
 	"net"
 	"time"
+
+	"github.com/yusing/godoxy/agent/pkg/agent/common"
 )
 
 type TCPClient struct {
@@ -40,6 +42,7 @@ func NewTCPClient(serverAddr, targetAddress string, caCert *x509.Certificate, cl
 		Certificates: []tls.Certificate{*clientCert},
 		RootCAs:      caCertPool,
 		MinVersion:   tls.VersionTLS12,
+		ServerName:   common.CertsDNSName,
 	}
 
 	// Establish TLS connection
diff --git a/agent/pkg/agent/stream/udp_client.go b/agent/pkg/agent/stream/udp_client.go
index 9365da0d..a6998358 100644
--- a/agent/pkg/agent/stream/udp_client.go
+++ b/agent/pkg/agent/stream/udp_client.go
@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/pion/dtls/v3"
+	"github.com/yusing/godoxy/agent/pkg/agent/common"
 )
 
 type UDPClient struct {
@@ -43,6 +44,7 @@ func NewUDPClient(serverAddr, targetAddress string, caCert *x509.Certificate, cl
 		RootCAs:              caCertPool,
 		InsecureSkipVerify:   false,
 		ExtendedMasterSecret: dtls.RequireExtendedMasterSecret,
+		ServerName:           common.CertsDNSName,
 	}
 
 	raddr, err := net.ResolveUDPAddr("udp", serverAddr)