Plesk panel inaccessible 403 forbidden

Hi guys,
I have a critic problem with Plesk

Symptoms:

• Plesk panel inaccessible 403 forbidden nginx
• FTP inaccessible
• plesk command not found (version 12.5.30)

System Details:

• Ubuntu 14.04.5 LTS
• Plesk Version:

<patches>
<product id="plesk" version="12.5.30" installed-at="20160112T101238">
<patch version="56" timestamp="" installed-at="20170104T121812" />
</product>
System...

Plesk panel inaccessible 403 forbidden