diff --git a/CMakeLists.txt b/CMakeLists.txt
index 720a7bf4..1115745c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,7 +88,7 @@ target_link_libraries(neuron-base nng libzlog.so jansson mqttc jwt
 add_dependencies(neuron-base neuron-version)
 
 # dependency imposed by nng
-find_package(MbedTLS)
+#find_package(MbedTLS)
 target_link_libraries(neuron-base mbedtls mbedx509 mbedcrypto)
 
 set(PERSIST_SOURCES
diff --git a/plugins/restful/adapter_handle.c b/plugins/restful/adapter_handle.c
index 22e0bc16..18da15fe 100644
--- a/plugins/restful/adapter_handle.c
+++ b/plugins/restful/adapter_handle.c
@@ -37,7 +37,7 @@ void handle_add_adapter(nng_aio *aio)
 
     REST_PROCESS_HTTP_REQUEST_VALIDATE_JWT(
         aio, neu_json_add_node_req_t, neu_json_decode_add_node_req, {
-            if (strlen(req->name) > NEU_NODE_NAME_LEN) {
+            if (strlen(req->name) >= NEU_NODE_NAME_LEN) {
                 NEU_JSON_RESPONSE_ERROR(NEU_ERR_NODE_NAME_TOO_LONG, {
                     http_response(aio, NEU_ERR_NODE_NAME_TOO_LONG,
                                   result_error);
diff --git a/plugins/restful/group_config_handle.c b/plugins/restful/group_config_handle.c
index a8a4652a..7ee70ab5 100644
--- a/plugins/restful/group_config_handle.c
+++ b/plugins/restful/group_config_handle.c
@@ -36,7 +36,7 @@ void handle_add_group_config(nng_aio *aio)
     REST_PROCESS_HTTP_REQUEST_VALIDATE_JWT(
         aio, neu_json_add_group_config_req_t,
         neu_json_decode_add_group_config_req, {
-            if (strlen(req->group) > NEU_GROUP_NAME_LEN) {
+            if (strlen(req->group) >= NEU_GROUP_NAME_LEN) {
                 NEU_JSON_RESPONSE_ERROR(NEU_ERR_GROUP_NAME_TOO_LONG, {
                     http_response(aio, NEU_ERR_GROUP_NAME_TOO_LONG,
                                   result_error);
diff --git a/src/adapter/driver/driver.c b/src/adapter/driver/driver.c
index 8cf9a7a2..df7f5fb6 100644
--- a/src/adapter/driver/driver.c
+++ b/src/adapter/driver/driver.c
@@ -564,11 +564,11 @@ int neu_adapter_driver_add_tag(neu_adapter_driver_t *driver, const char *group,
         return NEU_ERR_TAG_NAME_TOO_LONG;
     }
 
-    if (strlen(tag->address) > NEU_TAG_ADDRESS_LEN) {
+    if (strlen(tag->address) >= NEU_TAG_ADDRESS_LEN) {
         return NEU_ERR_TAG_ADDRESS_TOO_LONG;
     }
 
-    if (strlen(tag->description) > NEU_TAG_DESCRIPTION_LEN) {
+    if (strlen(tag->description) >= NEU_TAG_DESCRIPTION_LEN) {
         return NEU_ERR_TAG_DESCRIPTION_TOO_LONG;
     }