diff --git a/services/iam-service/src/core/cache/multi-layer-cache.ts b/services/iam-service/src/core/cache/multi-layer-cache.ts
index 133ac426..66e03768 100644
--- a/services/iam-service/src/core/cache/multi-layer-cache.ts
+++ b/services/iam-service/src/core/cache/multi-layer-cache.ts
@@ -9,7 +9,7 @@ import { getRedisClient } from '../../config/redis.config';
  */
 export class MultiLayerCache {
   private l1Cache: NodeCache; // In-memory cache
-  private redis: ReturnType<typeof getRedisClient>;
+  private redis: ReturnType<typeof getRedisClient> | null = null; // Disabled for testing
 
   constructor() {
     // L1: In-memory cache (10MB default, 60s default TTL)
@@ -19,8 +19,10 @@ export class MultiLayerCache {
       useClones: false, // Better performance
     });
 
-    // L2: Redis cache
-    this.redis = getRedisClient();
+    // EN: Temporarily disable L2 Redis cache to test performance
+    // VI: Tạm thời tắt L2 Redis cache để test hiệu suất
+    // TODO: Re-enable after fixing Redis EPIPE errors
+    // this.redis = getRedisClient();
   }
 
   /**
@@ -35,13 +37,15 @@ export class MultiLayerCache {
         return l1Value;
       }
 
-      // L2: Check Redis cache (< 5ms)
-      const l2Value = await this.redis.get(key);
-      if (l2Value) {
-        const parsed = JSON.parse(l2Value) as T;
-        // Warm up L1 cache
-        this.l1Cache.set(key, parsed, 60); // Cache 1 minute in L1
-        return parsed;
+      // L2: Check Redis cache (< 5ms) - only if Redis is enabled
+      if (this.redis) {
+        const l2Value = await this.redis.get(key);
+        if (l2Value) {
+          const parsed = JSON.parse(l2Value) as T;
+          // Warm up L1 cache
+          this.l1Cache.set(key, parsed, 60); // Cache 1 minute in L1
+          return parsed;
+        }
       }
 
       return null;
@@ -66,11 +70,13 @@ export class MultiLayerCache {
       // TODO: Re-enable after fixing Redis EPIPE errors
       /*
       // L2: Set Redis cache
-      const stringValue = JSON.stringify(value);
-      if (ttlSeconds) {
-        await this.redis.setex(key, ttlSeconds, stringValue);
-      } else {
-        await this.redis.set(key, stringValue);
+      if (this.redis) {
+        const stringValue = JSON.stringify(value);
+        if (ttlSeconds) {
+          await this.redis.setex(key, ttlSeconds, stringValue);
+        } else {
+          await this.redis.set(key, stringValue);
+        }
       }
       */
     } catch (error) {
@@ -108,7 +114,9 @@ export class MultiLayerCache {
       this.l1Cache.del(key);
 
       // L2: Delete from Redis
-      await this.redis.del(key);
+      if (this.redis) {
+        await this.redis.del(key);
+      }
     } catch (error) {
       logger.error('Multi-layer cache del error', { key, error });
     }
@@ -124,7 +132,7 @@ export class MultiLayerCache {
       keys.forEach(key => this.l1Cache.del(key));
 
       // L2: Delete from Redis
-      if (keys.length > 0) {
+      if (this.redis && keys.length > 0) {
         await this.redis.del(...keys);
       }
     } catch (error) {
@@ -143,21 +151,24 @@ export class MultiLayerCache {
       this.l1Cache.flushAll();
 
       // L2: Scan and delete matching keys in Redis
-      const stream = this.redis.scanStream({
-        match: pattern,
-        count: 100,
-      });
+      if (this.redis) {
+        const stream = this.redis.scanStream({
+          match: pattern,
+          count: 100,
+        });
 
-      const keys: string[] = [];
-      stream.on('data', (resultKeys: string[]) => {
-        keys.push(...resultKeys);
-      });
+        const keys: string[] = [];
+        stream.on('data', (resultKeys: string[]) => {
+          keys.push(...resultKeys);
+        });
 
-      stream.on('end', async () => {
-        if (keys.length > 0) {
-          await this.redis.del(...keys);
-        }
-      });
+        const redis = this.redis; // Capture for closure
+        stream.on('end', async () => {
+          if (keys.length > 0) {
+            await redis.del(...keys);
+          }
+        });
+      }
     } catch (error) {
       logger.error('Multi-layer cache invalidatePattern error', { pattern, error });
     }
diff --git a/services/iam-service/src/modules/common/cache.service.ts b/services/iam-service/src/modules/common/cache.service.ts
index bdddf34b..f9f9dbe5 100644
--- a/services/iam-service/src/modules/common/cache.service.ts
+++ b/services/iam-service/src/modules/common/cache.service.ts
@@ -1,21 +1,41 @@
 import { logger } from '@goodgo/logger';
 
-import { getRedisClient } from '../../config/redis.config';
+// EN: Temporarily disable Redis to prevent EPIPE errors
+// VI: Tạm thời tắt Redis để tránh lỗi EPIPE
+// import { getRedisClient } from '../../config/redis.config';
 
 /**
- * EN: Service for caching data (Redis wrapper)
- * VI: Service cho việc caching dữ liệu (Redis wrapper)
+ * EN: Service for caching data (In-memory fallback, Redis disabled)
+ * VI: Service cho việc caching dữ liệu (In-memory fallback, Redis đã tắt)
  */
 export class CacheService {
+    // EN: Temporary in-memory cache as fallback
+    // VI: Cache in-memory tạm thời làm fallback
+    private memoryCache: Map<string, { value: any; expiresAt: number }> = new Map();
+
     /**
      * EN: Get value from cache
      * VI: Lấy giá trị từ cache
      */
     async get<T>(key: string): Promise<T | null> {
         try {
-            const data = await getRedisClient().get(key);
-            if (!data) return null;
-            return JSON.parse(data) as T;
+            // EN: Use in-memory cache instead of Redis
+            // VI: Sử dụng in-memory cache thay vì Redis
+            const cached = this.memoryCache.get(key);
+            if (!cached) return null;
+
+            // Check expiration
+            if (cached.expiresAt < Date.now()) {
+                this.memoryCache.delete(key);
+                return null;
+            }
+
+            return cached.value as T;
+
+            // TODO: Re-enable after fixing Redis EPIPE errors
+            // const data = await getRedisClient().get(key);
+            // if (!data) return null;
+            // return JSON.parse(data) as T;
         } catch (error) {
             logger.error('Cache get error', { key, error });
             return null;
@@ -26,14 +46,20 @@ export class CacheService {
      * EN: Set value in cache
      * VI: Lưu giá trị vào cache
      */
-    async set(key: string, value: any, ttlSeconds?: number): Promise<void> {
+    async set(key: string, value: any, ttlSeconds: number = 300): Promise<void> {
         try {
-            const stringValue = JSON.stringify(value);
-            if (ttlSeconds) {
-                await getRedisClient().setex(key, ttlSeconds, stringValue);
-            } else {
-                await getRedisClient().set(key, stringValue);
-            }
+            // EN: Use in-memory cache instead of Redis
+            // VI: Sử dụng in-memory cache thay vì Redis
+            const expiresAt = Date.now() + (ttlSeconds * 1000);
+            this.memoryCache.set(key, { value, expiresAt });
+
+            // TODO: Re-enable after fixing Redis EPIPE errors
+            // const stringValue = JSON.stringify(value);
+            // if (ttlSeconds) {
+            //     await getRedisClient().setex(key, ttlSeconds, stringValue);
+            // } else {
+            //     await getRedisClient().set(key, stringValue);
+            // }
         } catch (error) {
             logger.error('Cache set error', { key, error });
         }
@@ -62,7 +88,12 @@ export class CacheService {
      */
     async del(key: string): Promise<void> {
         try {
-            await getRedisClient().del(key);
+            // EN: Use in-memory cache instead of Redis
+            // VI: Sử dụng in-memory cache thay vì Redis
+            this.memoryCache.delete(key);
+
+            // TODO: Re-enable after fixing Redis EPIPE errors
+            // await getRedisClient().del(key);
         } catch (error) {
             logger.error('Cache del error', { key, error });
         }