Question Please help!!, I can't access to my Plesk panel

[Fossy]

Hello:

Today I have update PHP 5.4 to 5.6 version and now I can't access to domains and plesk panel. CentOS 6.5 only have PHP 5.4, and I want to install an script that requires PHP 5.5 or later.

For update PHP version I used:

yum remove php-common
yum install php56w
yum install php56w-mysql
yum install php56w-common
yum install php56w-pdo
yum install php56w-opcache

And for downgrade to 5.4 I used:

yum remove php56w
yum remove php56w-common
yum install php-common
yum install php-mysql
yum install php

Webs don't work, and Plesk don't work (403 Forbidden - Nginx).

Please, how I can restore my Plesk panel and configuration?. Please, I need help!! :-(

Thanks!!.

 

[Fossy]

In Plesk log I get this:

2016/10/24 16:19:12 [error] 3377#0: *615 directory index of "/usr/local/psa/admin/htdocs/" is forbidden

But directory exists!!, and it have this content:

archives bu_pubkey.txt domains images locales migration.log sshterm theme

Please, I want to restore settings. How I can?.

Thanks!.