diff --git a/jcpp-app/src/main/java/sanbing/jcpp/app/service/grpc/DownlinkGrpcClient.java b/jcpp-app/src/main/java/sanbing/jcpp/app/service/grpc/DownlinkGrpcClient.java
index 2fe52bf..e4be0bc 100644
--- a/jcpp-app/src/main/java/sanbing/jcpp/app/service/grpc/DownlinkGrpcClient.java
+++ b/jcpp-app/src/main/java/sanbing/jcpp/app/service/grpc/DownlinkGrpcClient.java
@@ -202,7 +202,6 @@ public class DownlinkGrpcClient {
                 .directExecutor()
                 .keepAliveTime(keepAliveTimeSec, TimeUnit.SECONDS)
                 .usePlaintext()
-                .keepAliveTime(5, TimeUnit.MINUTES) // Change to a larger value, e.g. 5min.
                 .keepAliveTimeout(10, TimeUnit.SECONDS) // Change to a larger value, e.g. 10s.
                 .keepAliveWithoutCalls(true)// You should normally avoid enabling this.
                 .defaultLoadBalancingPolicy("round_robin")