Changed singlesite to multisite, but new site shows Maintenance

Found it!!!

/etc/apache2/sites-available/example.com.conf needs this line:
ServerAlias *.example.com

(The star was missing! – Merry Xmas)

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)