diff --git a/weed/s3api/filer_util.go b/weed/s3api/filer_util.go
index ad16a3b48..9dd9a684e 100644
--- a/weed/s3api/filer_util.go
+++ b/weed/s3api/filer_util.go
@@ -65,18 +65,10 @@ func doDeleteEntry(client filer_pb.SeaweedFilerClient, parentDirectoryPath strin
 
 	glog.V(1).Infof("delete entry %v/%v: %v", parentDirectoryPath, entryName, request)
 	if resp, err := client.DeleteEntry(context.Background(), request); err != nil {
-		// Treat NotFound as success for idempotency
-		if strings.Contains(err.Error(), filer_pb.ErrNotFound.Error()) {
-			return nil
-		}
 		glog.V(0).Infof("delete entry %v: %v", request, err)
 		return fmt.Errorf("delete entry %s/%s: %v", parentDirectoryPath, entryName, err)
 	} else {
 		if resp.Error != "" {
-			// Treat NotFound as success for idempotency
-			if strings.Contains(resp.Error, filer_pb.ErrNotFound.Error()) {
-				return nil
-			}
 			return fmt.Errorf("delete entry %s/%s: %v", parentDirectoryPath, entryName, resp.Error)
 		}
 	}
diff --git a/weed/s3api/s3api_bucket_handlers.go b/weed/s3api/s3api_bucket_handlers.go
index 36d630f95..edda10e2d 100644
--- a/weed/s3api/s3api_bucket_handlers.go
+++ b/weed/s3api/s3api_bucket_handlers.go
@@ -108,27 +108,6 @@ func (s3a *S3ApiServer) PutBucketHandler(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	// Idempotency: if bucket already exists and is owned by the requester, return success.
-	identityId := r.Header.Get(s3_constants.AmzIdentityId)
-	if existingEntry, err := s3a.getEntry(s3a.option.BucketsPath, bucket); err == nil && existingEntry != nil && existingEntry.IsDirectory {
-		if owner, ok := existingEntry.Extended[s3_constants.AmzIdentityId]; ok {
-			if string(owner) == identityId || identityId == "" {
-				w.Header().Set("Location", "/"+bucket)
-				writeSuccessResponseEmpty(w, r)
-				return
-			}
-		} else {
-			// No owner recorded; treat as success for idempotency
-			w.Header().Set("Location", "/"+bucket)
-			writeSuccessResponseEmpty(w, r)
-			return
-		}
-	} else if err != nil && !errors.Is(err, filer_pb.ErrNotFound) {
-		// Unexpected error fetching existing entry
-		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
-		return
-	}
-
 	// avoid duplicated buckets
 	errCode := s3err.ErrNone
 	if err := s3a.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
@@ -152,7 +131,26 @@ func (s3a *S3ApiServer) PutBucketHandler(w http.ResponseWriter, r *http.Request)
 		return
 	}
 	if exist, err := s3a.exists(s3a.option.BucketsPath, bucket, true); err == nil && exist {
-		errCode = s3err.ErrBucketAlreadyExists
+		// Check if the bucket is owned by the same user
+		identityId := r.Header.Get(s3_constants.AmzIdentityId)
+		if existingEntry, err := s3a.getEntry(s3a.option.BucketsPath, bucket); err == nil && existingEntry != nil {
+			if owner, ok := existingEntry.Extended[s3_constants.AmzIdentityId]; ok {
+				if string(owner) == identityId {
+					errCode = s3err.ErrBucketAlreadyOwnedByYou
+				} else {
+					errCode = s3err.ErrBucketAlreadyExists
+				}
+			} else {
+				// No owner recorded, treat as owned by current user if no identity
+				if identityId == "" {
+					errCode = s3err.ErrBucketAlreadyOwnedByYou
+				} else {
+					errCode = s3err.ErrBucketAlreadyExists
+				}
+			}
+		} else {
+			errCode = s3err.ErrBucketAlreadyExists
+		}
 	}
 	if errCode != s3err.ErrNone {
 		s3err.WriteErrorResponse(w, r, errCode)
@@ -213,10 +211,10 @@ func (s3a *S3ApiServer) DeleteBucketHandler(w http.ResponseWriter, r *http.Reque
 	bucket, _ := s3_constants.GetBucketAndObject(r)
 	glog.V(3).Infof("DeleteBucketHandler %s", bucket)
 
-	// Idempotency: if the bucket doesn't exist, return NoContent (success)
+	// Check if bucket exists - return proper AWS error if not found
 	if entry, err := s3a.getEntry(s3a.option.BucketsPath, bucket); err != nil || entry == nil {
 		if errors.Is(err, filer_pb.ErrNotFound) || entry == nil {
-			s3err.WriteEmptyResponse(w, r, http.StatusNoContent)
+			s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchBucket)
 			return
 		}
 		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)