Buenos días.
Retomo el tema de los permisos.
El resultado de los permisos de los archivos dentro de la carpeta instalación es:
ls -al
total 80
drwxr-x— 4 root www-data 4096 Apr 3 17:44 .
drwxr-x— 16 root www-data 4096 Apr 3 13:28 …
-rw-r----- 1 root www-data 5 Apr 3 13:21 VERSION
-rw-r----- 1 root www-data 126 Apr 3 13:22 afip.ini
-rw-r----- 1 root www-data 614 Apr 3 13:21 bases.ini
-rw-r----- 1 root www-data 150 Apr 3 13:21 cas.ini
-rw-r----- 1 root www-data 286 Apr 3 13:21 entorno_toba.env
drwxrwx— 5 root www-data 4096 Apr 3 13:21 i__produccion
-rw-r----- 1 root www-data 281 Apr 3 13:22 instalacion.ini
-rw-r----- 1 root www-data 76 Apr 3 13:21 ldap.ini
drwxrwx— 2 root www-data 4096 Apr 3 13:21 logs_comandos
-rw-r----- 1 root www-data 1051 Apr 3 13:21 openid.ini
-rw-r----- 1 root www-data 938 Apr 3 13:21 openssl.ini
-rw-r----- 1 root www-data 192 Apr 3 13:21 rdi.ini
-rw-r----- 1 root www-data 75 Apr 3 13:22 resthooks.ini
-rw-r----- 1 root www-data 905 Apr 3 13:21 saml.ini
-rw-r----- 1 root www-data 859 Apr 3 13:21 saml_onelogin.ini
-rw-r----- 1 root www-data 106 Apr 3 17:44 smtp.ini
-rw-r----- 1 root www-data 4027 Apr 3 13:21 toba.conf
-rw-r----- 1 root www-data 31 Apr 3 13:21 web_server.ini