diff --git a/src/main/java/com/eactive/eai/custom/alarm/ums/UmsService.java b/src/main/java/com/eactive/eai/custom/alarm/ums/UmsService.java
index 74777de..cc2b114 100644
--- a/src/main/java/com/eactive/eai/custom/alarm/ums/UmsService.java
+++ b/src/main/java/com/eactive/eai/custom/alarm/ums/UmsService.java
@@ -1,20 +1,15 @@
 package com.eactive.eai.custom.alarm.ums;
 
-import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 
-import javax.annotation.PreDestroy;
-
 import org.apache.hc.client5.http.classic.methods.HttpPost;
 import org.apache.hc.client5.http.config.RequestConfig;
 import org.apache.hc.client5.http.entity.EntityBuilder;
 import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
 import org.apache.hc.client5.http.impl.classic.HttpClients;
-import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManagerBuilder;
-import org.apache.hc.client5.http.io.HttpClientConnectionManager;
 import org.apache.hc.core5.http.ContentType;
+import org.apache.hc.core5.http.HttpVersion;
 import org.apache.hc.core5.http.io.entity.EntityUtils;
-import org.apache.hc.core5.util.TimeValue;
 import org.apache.hc.core5.util.Timeout;
 import org.springframework.stereotype.Component;
 
@@ -43,24 +38,6 @@ public class UmsService {
     private final static String DEFAULT_API_KEY = "7cca6d58-e4f7-474d-9edd-525806bc99ff";
     private final static String AUTHORIZATION_FMT = "Bearer %s";
 
-    // 재사용되는 HttpClient (Thread-Safe)
-    private final CloseableHttpClient httpClient;
-
-    public UmsService() {
-        // 커넥션 풀 설정: 매번 소켓을 열고 닫지 않고 재사용함
-        HttpClientConnectionManager cm = PoolingHttpClientConnectionManagerBuilder.create()
-                .setMaxConnTotal(100)      // 전체 최대 커넥션 수
-                .setMaxConnPerRoute(20)    // 호스트당 최대 커넥션 수
-                .setConnectionTimeToLive(TimeValue.ofMinutes(3))  // TTL
-                .setValidateAfterInactivity(TimeValue.ofSeconds(5)) // 🔥 중요
-                .build();
-
-        this.httpClient = HttpClients.custom()
-                .setConnectionManager(cm)
-                .evictExpiredConnections()                     // 만료 제거
-                .evictIdleConnections(TimeValue.ofSeconds(20)) // 20초 idle 제거
-                .build();
-    }
 
     public UmsCallResult send(UmsRequestPayload payload) throws Exception {
         if (payload.getContent() == null) {
@@ -95,6 +72,9 @@ public class UmsService {
                 .setContentType(ContentType.APPLICATION_JSON)
                 .setContentEncoding("UTF-8")
                 .build());
+        
+        httpPost.setVersion(HttpVersion.HTTP_1_0);
+        httpPost.setHeader("Connection", "close");
 
         // 3. 타임아웃 설정 (설정파일 값 적용)
         RequestConfig config = RequestConfig.custom()
@@ -109,7 +89,7 @@ public class UmsService {
         }
 
         // 4. 실행 (HttpClient 재사용)
-        try {
+        try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
             return httpClient.execute(httpPost, response -> {
                 String body = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
                 
@@ -140,15 +120,4 @@ public class UmsService {
         }
     }
 
-    @PreDestroy
-    public void destroy() {
-        try {
-            if (httpClient != null) {
-                httpClient.close();
-                logger.info("UMS HttpClient closed.");
-            }
-        } catch (IOException e) {
-            logger.error("Error closing UMS HttpClient", e);
-        }
-    }
 }
\ No newline at end of file