it solved now the site is working … i have one more query
i install ssl certificate on my website but my domain not change it remain same like previous http … from where i can change that https
in domain section it shows our site like … it shows http my site name … i want to change it to https:/www.mysitename
Try to change the URL on the WordPress settings so that it points to the HTTPS version of the website (and if you want also www). If you don’t know how to do that, log in to your WordPress admin panel, then on the menu click on Settings, then change both WordPress Address and Site Address to have https instead of http and, if you want, also put www. before the subdomain name, then scroll down and click on “Save Changes” and you might need to log in again.
I see you’re running a WordPress Multisite instance. Follow this guide then; you’ll have to do that manually via database and with a final step on the wp-admin.php file instead: