Main site is currently unable to handle this request. HTTP ERROR 500

Thank you for support.

1.

Main site isn’t working,is currently unable to handle this request.

HTTP ERROR 500

But /wp-admin and subsite still could log in to. I reboot the server, main site still not work.

2.

I can not connect FTP yet, so didn’t do any thing.

hits are from bots from where? why have those bots?

3.

If use WPS Hide Login

The wp-admin directory and wp-login.php page become inaccessible, so you should bookmark or remember the url. So how other user how can reg or log in the site?

4. If rename file xmlrpc.php located in your root folder, to xmlrpc ie remove the php extension. any side results?

Support is open.

Thanks!