diff --git a/app/api/challenge.py b/app/api/challenge.py
index 12b024a..e61d2cc 100644
--- a/app/api/challenge.py
+++ b/app/api/challenge.py
@@ -1,5 +1,6 @@
 from json import JSONDecodeError
 from logging import log
+import sys
 from app.monitoring.ctf_metrics_collector import ChallengeMetricsCollector
 from flask import Blueprint, jsonify, request
 
@@ -30,7 +31,7 @@ def create_challenge():
     client = K8sClient()
     endpoint = client.create_challenge_resource(challenge_id, username)
     if not endpoint:
-        raise  UserChallengeCreationError(error_msg=f"Failed to create challenge {challenge_id} for user {username}")
+        raise  UserChallengeCreationError(error_msg=f"Failed to create challenge {challenge_id} for user {username} : Endpoint did not exist")
     
     return jsonify({'data' : {'port': endpoint}}), 200
 
@@ -68,21 +69,24 @@ def get_userchallenge_status():
     try:
         # Challenge 관련 정보 가져오기
         res = request.get_json()
+        print(f"/status : {res}",file=sys.stderr)
         if not res:
-            raise UserChallengeDeletionError(error_msg="Request body is empty or not valid JSON")
+            raise InvalidRequest(error_msg="Request body is empty or not valid JSON")
 
         if 'challenge_id' not in res:
             raise InvalidRequest(error_msg="Required field 'challenge_id' is missing in request")
+        
         challenge_id = res['challenge_id']
+        if not challenge_id:
+            raise InvalidRequest(error_msg="'challenge_id' is empty or not valid")
 
         if 'username' not in res:
             raise InvalidRequest(error_msg="Required field 'username' is missing in request")
-        
     
         username = res['username']
         if not username:
-            raise InvalidRequest(error_msg="Required field 'username' is missing in request")
-        
+            raise InvalidRequest(error_msg="'username' is empty or not valid")
+                
         # 사용자 챌린지 상태 조회
         repo = UserChallengesRepository()
         status = repo.get_status(challenge_id, username)
@@ -90,4 +94,4 @@ def get_userchallenge_status():
             raise UserChallengeNotFoundError(error_msg=f"User challenge not found for {username} and {challenge_id}")
         return jsonify({'data': {'status': status}}), 200
     except Exception as e:
-        raise UserChallengeNotFoundError(error_msg=str(e)) from e
\ No newline at end of file
+        raise UserChallengeNotFoundError(error_msg=str(e))
\ No newline at end of file
diff --git a/app/exceptions/error_types.py b/app/exceptions/error_types.py
index 5410f7b..d7f28eb 100644
--- a/app/exceptions/error_types.py
+++ b/app/exceptions/error_types.py
@@ -52,3 +52,4 @@ class ApiErrorTypes(str, Enum):
     INTERNAL_ERROR = "INTERNAL_ERROR"                 # 내부 서버 에러
     DATABASE_ERROR = "DATABASE_ERROR"                 # 데이터베이스 에러
     EXTERNAL_SERVICE_ERROR = "EXTERNAL_SERVICE_ERROR" # 외부 서비스 에러
+    INTERNAL_SERVER_ERROR = "INTERNAL_SERVER_ERROR"   # 서버 내부 에러
diff --git a/app/extensions/db/repository.py b/app/extensions/db/repository.py
index a5e0176..86b0deb 100644
--- a/app/extensions/db/repository.py
+++ b/app/extensions/db/repository.py
@@ -38,6 +38,7 @@ def create(self, username: str, C_idx: int, userChallengeName: str,
             self.session.commit()
             return challenge
         except SQLAlchemyError as e:
+            
             self.session.rollback()
             raise InternalServerError(error_msg=f"Error creating challenge in db: {e}") from e
 
@@ -70,15 +71,17 @@ def update_status(self, challenge: UserChallenges, new_status: str) -> bool:
         """
         try:
             challenge.status = new_status
-            self.session.add(challenge)  # Add this line to track the object
-            self.session.flush()  
+            # self.session.add(challenge)  # Add this line to track the object
+            # self.session.flush()  
             self.session.commit()
             return True
         except SQLAlchemyError as e:
             # logger.error(f"Error updating challenge status: {e}")
+
             self.session.rollback()
             raise InternalServerError(error_msg=f"Error updating challenge status: {e}") from e
 
+
     def update_port(self, challenge: UserChallenges, port: int) -> bool:
         """
         챌린지 포트 업데이트
@@ -91,13 +94,19 @@ def update_port(self, challenge: UserChallenges, port: int) -> bool:
             bool: 업데이트 성공 여부
         """
         try:
-            challenge.port = port
+            # 1) 먼저 challenge 객체를 세션에 맞게 merge
+            fresh_challenge = self.session.merge(challenge)
+
+            # 2) merge된 객체에 port 갱신
+            fresh_challenge.port = port
+
             self.session.commit()
             return True
         except SQLAlchemyError as e:
             self.session.rollback()
             raise InternalServerError(error_msg=f"Error updating challenge port: {e}") from e
 
+
     def is_running(self, challenge: UserChallenges) -> bool:
         """
         챌린지 실행 여부 확인
diff --git a/app/extensions/k8s/client.py b/app/extensions/k8s/client.py
index 87a6612..0eeed02 100644
--- a/app/extensions/k8s/client.py
+++ b/app/extensions/k8s/client.py
@@ -106,6 +106,7 @@ def create_challenge_resource(self, challenge_id, username, namespace="default")
             body=challenge_manifest
         )
 
+        time.sleep(5)
         # status 값 가져오기
         status = challenge.get('status', {})
         endpoint = status.get('endpoint')