Final I found the solution. Replace the Base URL from http://example.com to //example.com CAUTION! The change is not allowed in magento2 admin. I made it in MySQL in table cron_config_data and record with path='web/unsecure/base_url'. After cache:clean and varnish restart everything works smoothly in frontend. Unfortunately problem remains in Backend. Magento2 redirects to this url: https://example.com/admin_mine/index/example.com/admin_mine/index/index/key/... Can someone inform where magento2 make the admin redirection?