diff --git a/pkg/api/target/target.go b/pkg/api/target/target.go
index e02f9b96..146a2e42 100644
--- a/pkg/api/target/target.go
+++ b/pkg/api/target/target.go
@@ -81,7 +81,6 @@ func (t *Target) CreateGNMIClient(ctx context.Context, opts ...grpc.DialOption)
 		return err
 	}
 	opts = append(opts, tOpts...)
-	opts = append(opts, grpc.WithBlock())
 	// create a gRPC connection
 	addrs := strings.Split(t.Config.Address, ",")
 	numAddrs := len(addrs)
diff --git a/pkg/app/app.go b/pkg/app/app.go
index 0b37397e..50896429 100644
--- a/pkg/app/app.go
+++ b/pkg/app/app.go
@@ -320,18 +320,22 @@ func (a *App) PrintMsg(address string, msgName string, msg proto.Message) error
 	return nil
 }
 
-func (a *App) createCollectorDialOpts() []grpc.DialOption {
-	opts := []grpc.DialOption{grpc.WithBlock()}
+func (a *App) createCollectorDialOpts() {
+	// append gRPC userAgent name
+	opts := []grpc.DialOption{grpc.WithUserAgent(fmt.Sprintf("gNMIc/%s", version))}
+	// add maxMsgSize
 	if a.Config.MaxMsgSize > 0 {
 		opts = append(opts, grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(a.Config.MaxMsgSize)))
 	}
+	// Set NoProxy
 	if !a.Config.ProxyFromEnv {
 		opts = append(opts, grpc.WithNoProxy())
 	}
-	opts = append(opts, grpc.WithUserAgent(fmt.Sprintf("gNMIc/%s", version)))
+	// add gzip compressor
 	if a.Config.Gzip {
 		opts = append(opts, grpc.WithDefaultCallOptions(grpc.UseCompressor(gzip.Name)))
 	}
+	// enable metrics
 	if a.Config.APIServer != nil && a.Config.APIServer.EnableMetrics && a.reg != nil {
 		grpcClientMetrics := grpc_prometheus.NewClientMetrics()
 		opts = append(opts,
@@ -341,7 +345,6 @@ func (a *App) createCollectorDialOpts() []grpc.DialOption {
 		a.reg.MustRegister(grpcClientMetrics)
 	}
 	a.dialOpts = opts
-	return opts
 }
 
 func (a *App) watchConfig() {
diff --git a/pkg/app/gnmi_client_subscribe.go b/pkg/app/gnmi_client_subscribe.go
index e15b787f..14eea8da 100644
--- a/pkg/app/gnmi_client_subscribe.go
+++ b/pkg/app/gnmi_client_subscribe.go
@@ -185,7 +185,8 @@ CRCLIENT:
 	case <-gnmiCtx.Done():
 		return gnmiCtx.Err()
 	default:
-		targetDialOpts := a.dialOpts
+		targetDialOpts := make([]grpc.DialOption, len(a.dialOpts))
+		copy(targetDialOpts, a.dialOpts)
 		if a.Config.UseTunnelServer {
 			a.ttm.Lock()
 			a.tunTargetCfn[tunnel.Target{ID: tc.Name, Type: tc.TunnelTargetType}] = cancel