diff --git a/src/routes/apps.js b/src/routes/apps.js
index 8c4cc3f4e..6800c8cd9 100644
--- a/src/routes/apps.js
+++ b/src/routes/apps.js
@@ -144,6 +144,8 @@ function configureApp(req, res, next) {
 
     apps.configure(req.params.id, data.location, data.portBindings, data.accessRestriction, function (error) {
         if (error && error.reason === AppsError.ALREADY_EXISTS) return next(new HttpError(409, error.message));
+        if (error && error.reason === AppsError.PORT_RESERVED) return next(new HttpError(409, 'Port ' + error.message + ' is reserved.'));
+        if (error && error.reason === AppsError.PORT_CONFLICT) return next(new HttpError(409, 'Port ' + error.message + ' is already in use.'));
         if (error && error.reason === AppsError.NOT_FOUND) return next(new HttpError(404, 'No such app'));
         if (error && error.reason === AppsError.BAD_STATE) return next(new HttpError(409, error.message));
         if (error && error.reason === AppsError.BAD_FIELD) return next(new HttpError(400, error.message));