<Files 403.shtml>
order allow,deny
allow from all
</Files>
deny from 216.170.118.18
deny from 216.170.118.16
deny from 104.232.36.157
deny from 216.170.126.108
deny from 216.170.126.17
deny from 216.170.118.140
deny from 216.170.115.141
deny from 216.170.118.17
Could it be that the admin tools somehow made those changes as a security measure?