diff --git a/run.sh b/run.sh
index 06606e6785..7133829e88 100755
--- a/run.sh
+++ b/run.sh
@@ -283,7 +283,7 @@ function run_build()
     echo "#define PEGASUS_GIT_COMMIT \"$PEGASUS_GIT_COMMIT\"" >>$GIT_COMMIT_FILE
 
     # rebuild link
-    rm -f ${ROOT}/src/builder
+    rm -rf ${ROOT}/src/builder
     ln -s ${BUILD_DIR} ${ROOT}/src/builder
 
     echo "[$(date)] Building Pegasus ..."
diff --git a/src/rdsn/src/runtime/nativerun.cpp b/src/rdsn/src/runtime/nativerun.cpp
index ed60f691c8..e548f792f6 100644
--- a/src/rdsn/src/runtime/nativerun.cpp
+++ b/src/rdsn/src/runtime/nativerun.cpp
@@ -34,11 +34,13 @@
  */
 
 #include <dsn/tool/nativerun.h>
-#include <dsn/utility/config_api.h>
+#include <dsn/utility/flags.h>
 
 namespace dsn {
 namespace tools {
 
+DSN_DECLARE_bool(enable_udp);
+
 void nativerun::install(service_spec &spec)
 {
     if (spec.env_factory_name == "")
@@ -60,8 +62,7 @@ void nativerun::install(service_spec &spec)
         cs2.message_buffer_block_size = 1024 * 64;
         spec.network_default_server_cfs[cs2] = cs2;
     }
-    if (dsn_config_get_value_bool(
-            "network", "enable_udp", false, "whether to enable udp rpc engine")) {
+    if (FLAGS_enable_udp) {
         {
             network_client_config cs;
             cs.factory_name = "dsn::tools::asio_udp_provider";
diff --git a/src/rdsn/src/runtime/providers.common.cpp b/src/rdsn/src/runtime/providers.common.cpp
index 79a9c72046..d60ca691dd 100644
--- a/src/rdsn/src/runtime/providers.common.cpp
+++ b/src/rdsn/src/runtime/providers.common.cpp
@@ -35,6 +35,7 @@
 
 #include "runtime/rpc/asio_net_provider.h"
 #include <dsn/tool/providers.common.h>
+#include <dsn/utility/flags.h>
 #include "utils/lockp.std.h"
 #include "runtime/task/simple_task_queue.h"
 #include "runtime/task/hpc_task_queue.h"
@@ -47,6 +48,8 @@
 namespace dsn {
 namespace tools {
 
+DSN_DEFINE_bool("network", enable_udp, true, "whether to enable udp rpc engine");
+
 void register_std_lock_providers()
 {
     lock_provider::register_component<std_lock_provider>("dsn::tools::std_lock_provider");
@@ -64,8 +67,7 @@ void register_common_providers()
 
     register_std_lock_providers();
 
-    if (dsn_config_get_value_bool(
-            "network", "enable_udp", false, "whether to enable udp rpc engine")) {
+    if (FLAGS_enable_udp) {
         register_component_provider<asio_udp_provider>("dsn::tools::asio_udp_provider");
     }
     register_component_provider<asio_network_provider>("dsn::tools::asio_network_provider");
diff --git a/src/rdsn/src/runtime/task/task_spec.cpp b/src/rdsn/src/runtime/task/task_spec.cpp
index 6b469ec865..de561f2973 100644
--- a/src/rdsn/src/runtime/task/task_spec.cpp
+++ b/src/rdsn/src/runtime/task/task_spec.cpp
@@ -39,9 +39,13 @@
 #include <dsn/tool-api/task_spec.h>
 #include <dsn/tool-api/command_manager.h>
 #include <dsn/tool-api/threadpool_spec.h>
+#include <dsn/utility/flags.h>
 #include <dsn/utility/smart_pointers.h>
 
 namespace dsn {
+namespace tools {
+DSN_DECLARE_bool(enable_udp);
+}
 
 constexpr int TASK_SPEC_STORE_CAPACITY = 512;
 
@@ -232,6 +236,12 @@ bool task_spec::init()
                 return false;
             }
         }
+
+        if (spec->rpc_call_channel == RPC_CHANNEL_UDP && !dsn::tools::FLAGS_enable_udp) {
+            derror("task rpc_call_channel RPC_CHANNEL_UCP need udp service, set network "
+                   "configuration enable_udp true");
+            return false;
+        }
     }
 
     ::dsn::command_manager::instance().register_command(
diff --git a/src/rdsn/src/runtime/test/config-test-corrupt-message.ini b/src/rdsn/src/runtime/test/config-test-corrupt-message.ini
index 346ebae051..92efa64dda 100644
--- a/src/rdsn/src/runtime/test/config-test-corrupt-message.ini
+++ b/src/rdsn/src/runtime/test/config-test-corrupt-message.ini
@@ -75,7 +75,6 @@ random_seed = 0
 [network]
 ; how many network threads for network library (used by asio)
 io_service_worker_count = 2
-enable_udp = true
 
 [task..default]
 is_trace = true
diff --git a/src/rdsn/src/runtime/test/config-test.ini b/src/rdsn/src/runtime/test/config-test.ini
index d53cf1d551..08ee8009e7 100644
--- a/src/rdsn/src/runtime/test/config-test.ini
+++ b/src/rdsn/src/runtime/test/config-test.ini
@@ -91,7 +91,6 @@ random_seed = 0
 [network]
 ; how many network threads for network library (used by asio)
 io_service_worker_count = 2
-enable_udp = true
 
 [task..default]
 is_trace = true
diff --git a/src/server/config.ini b/src/server/config.ini
index 39c15af566..206fc0762b 100644
--- a/src/server/config.ini
+++ b/src/server/config.ini
@@ -94,7 +94,6 @@
   io_service_worker_count = 4
   ; how many connections can be established from one ip address to a server(both replica and meta), 0 means no threshold
   conn_threshold_per_ip = 0
-  enable_udp = false
 
 ; specification for each thread pool
 [threadpool..default]
@@ -709,10 +708,12 @@
 
 [task.RPC_FD_FAILURE_DETECTOR_PING]
   rpc_call_header_format = NET_HDR_DSN
+  rpc_call_channel = RPC_CHANNEL_UDP
   rpc_message_crc_required = true
   ;is_profile = true
 
 [task.RPC_FD_FAILURE_DETECTOR_PING_ACK]
   rpc_call_header_format = NET_HDR_DSN
+  rpc_call_channel = RPC_CHANNEL_UDP
   rpc_message_crc_required = true
   ;is_profile = true