diff --git a/pkg/internal/directory/service.go b/pkg/internal/directory/service.go
index 0a8fba6..bfe4ca9 100644
--- a/pkg/internal/directory/service.go
+++ b/pkg/internal/directory/service.go
@@ -1,6 +1,9 @@
 package directory
 
-import "google.golang.org/grpc"
+import (
+	"github.com/rs/zerolog/log"
+	"google.golang.org/grpc"
+)
 
 type ServiceInstance struct {
 	ID       string  `json:"id"`
@@ -9,21 +12,24 @@ type ServiceInstance struct {
 	GrpcAddr string  `json:"grpc_addr"`
 	HttpAddr *string `json:"http_addr"`
 
-	grpcConn   *grpc.ClientConn
 	retryCount int
 }
 
+var connectionCache = make(map[string]*grpc.ClientConn)
+
 func (v *ServiceInstance) GetGrpcConn() (*grpc.ClientConn, error) {
-	if v.grpcConn != nil {
-		return v.grpcConn, nil
+	if conn, ok := connectionCache[v.ID]; ok {
+		return conn, nil
 	}
 
-	var err error
-	v.grpcConn, err = ConnectService(v)
+	conn, err := ConnectService(v)
 	if err != nil {
 		_ = RemoveServiceInstance(v.ID)
+		log.Error().Str("id", v.ID).Err(err).Msg("Failed to connect to service, dropped...")
 		return nil, err
+	} else {
+		connectionCache[v.ID] = conn
 	}
 
-	return v.grpcConn, nil
+	return conn, nil
 }
diff --git a/pkg/internal/directory/validator.go b/pkg/internal/directory/validator.go
new file mode 100644
index 0000000..663a9ea
--- /dev/null
+++ b/pkg/internal/directory/validator.go
@@ -0,0 +1,35 @@
+package directory
+
+import "github.com/rs/zerolog/log"
+
+func ValidateServices() {
+	services := ListServiceInstance()
+	if len(services) == 0 {
+		return
+	}
+
+	checklist := make(map[string]bool)
+	successCount := 0
+	log.Info().Int("count", len(services)).Msg("Validating services...")
+	for _, service := range services {
+		if _, ok := checklist[service.GrpcAddr]; ok {
+			_ = RemoveServiceInstance(service.ID)
+			log.Warn().Str("id", service.ID).Str("addr", service.GrpcAddr).Msg("Duplicated service address, dropped...")
+			continue
+		}
+		// Directly use the connect method to skip cache
+		if _, err := ConnectService(service); err != nil {
+			_ = RemoveServiceInstance(service.ID)
+			log.Warn().Err(err).Str("id", service.ID).Str("addr", service.GrpcAddr).Msg("Unable connect to service, dropped...")
+			continue
+		}
+
+		successCount++
+	}
+
+	log.Info().
+		Int("success", successCount).
+		Int("failed", len(services)-successCount).
+		Int("total", len(services)).
+		Msg("Service validation completed.")
+}
diff --git a/pkg/main.go b/pkg/main.go
index af8eff3..7d0651e 100644
--- a/pkg/main.go
+++ b/pkg/main.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"git.solsynth.dev/hypernet/nexus/pkg/internal/auth"
 	"git.solsynth.dev/hypernet/nexus/pkg/internal/database"
+	"git.solsynth.dev/hypernet/nexus/pkg/internal/directory"
 	"git.solsynth.dev/hypernet/nexus/pkg/internal/http"
 	"git.solsynth.dev/hypernet/nexus/pkg/internal/kv"
 	"git.solsynth.dev/hypernet/nexus/pkg/nex/sec"
@@ -93,6 +94,9 @@ func main() {
 		log.Info().Msg("Internal jwt private key loaded.")
 	}
 
+	// Post-boot actions
+	directory.ValidateServices()
+
 	// Server
 	go server.NewServer().Listen()