nginx is disabled in config after update

[Greg]

Firstly, I apologize for not being an expert in this field.

I have a dedicated server with OVH running CentOS 6.6 (Final) and Plesk version 12.0.18 Update #70.

When it was auto-updated to the above version, nginx suddenly stopped working. Thus, the websites stopped loading since HTTP and HTTPS ports weren't open.

My server admin tried to restart nginx but got this error
[root@server1 default]# /etc/init.d/nginx restart
Not starting nginx as it is disabled in config

So we had to manually enable it with command /usr/local/psa/admin/bin/nginxmng --enable

I am wondering if it is possible Plesk did this automatically when updating, and if there is a way to ensure it doesn't happen again.

Thanks in advance for any help.