diff --git a/api/handler/put_test.go b/api/handler/put_test.go
index 66dca11..52f6296 100644
--- a/api/handler/put_test.go
+++ b/api/handler/put_test.go
@@ -492,7 +492,7 @@ func TestCreateBucketWithoutPermissions(t *testing.T) {
 	hc.h.ape.(*apeMock).err = errors.New("no permissions")
 
 	box, _ := createAccessBox(t)
-	createBucketAssertS3Error(hc, bktName, box, s3errors.ErrInternalError)
+	createBucketAssertS3Error(hc, bktName, box, apierr.ErrInternalError)
 
 	_, err := hc.tp.ContainerID(bktName)
 	require.Errorf(t, err, "container exists after failed creation, but shouldn't")
diff --git a/api/middleware/auth.go b/api/middleware/auth.go
index cbdceb2..202f28c 100644
--- a/api/middleware/auth.go
+++ b/api/middleware/auth.go
@@ -10,7 +10,6 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/acl"
 	apierr "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
-	frosterr "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -57,8 +56,8 @@ func Auth(center Center, log *zap.Logger) Func {
 					reqLogOrDefault(ctx, log).Debug(logs.CouldntReceiveAccessBoxForGateKeyRandomKeyWillBeUsed, zap.Error(err))
 				} else {
 					reqLogOrDefault(ctx, log).Error(logs.FailedToPassAuthentication, zap.Error(err))
-					err = frosterr.UnwrapErr(err)
-					if _, ok := err.(apierr.Error); !ok {
+					err = apierr.TransformToS3Error(err)
+					if err.(apierr.Error).ErrCode == apierr.ErrInternalError {
 						err = apierr.GetAPIError(apierr.ErrAccessDenied)
 					}
 					if _, wrErr := WriteErrorResponse(w, GetReqInfo(r.Context()), err); wrErr != nil {
diff --git a/api/router_test.go b/api/router_test.go
index a219109..18fe336 100644
--- a/api/router_test.go
+++ b/api/router_test.go
@@ -862,6 +862,12 @@ func TestAuthenticate(t *testing.T) {
 
 	chiRouter.cfg.Center.(*centerMock).err = frostfs.ErrGatewayTimeout
 	createBucketErr(chiRouter, "", "bkt-3", nil, apierr.ErrGatewayTimeout)
+
+	chiRouter.cfg.Center.(*centerMock).err = apierr.GetAPIError(apierr.ErrInternalError)
+	createBucketErr(chiRouter, "", "bkt-3", nil, apierr.ErrAccessDenied)
+
+	chiRouter.cfg.Center.(*centerMock).err = apierr.GetAPIError(apierr.ErrBadRequest)
+	createBucketErr(chiRouter, "", "bkt-3", nil, apierr.ErrBadRequest)
 }
 
 func TestFrostFSIDValidation(t *testing.T) {