ReadyNAS 516 on OS 6.7.1 - Unable to access admin page

Hi mdgm!

Thanks for the hint to work with VirtualBox and to compare vanilla OS 6.0.6 with my current build.

The files at /etc/frontview and the respective .conf files are still there, that's the good news!

Comparing the apache2 setup I noticed two differences:

1) Links within /sites-enabled: like in vanilla OS 6 I have two links:

000-fv-http -> /etc/apache2/sites-available/fv-http
000-fv-https -> ../sites-available/fv-https

but 000-fv-http differs from vanilla OS6, which points to ../sites-available/fv-http-admin

000-fv-http -> ../sites-available/fv-http-admin
000-fv-https -> ../sites-available/fv-https

changing this and restarting apache2 unfortunately did not change anything, still getting a 404 when requesting http://<ip>/admin

2) Comparing the /etc/apache2/apache2.conf I noticed another difference:

Below section is completly missing in vanilla OS 6:

# Sets the default security model of the Apache2 HTTPD server. It does
# not allow access to the root filesystem outside of /usr/share and /var/www.
# The former is used by web applications packaged in Debian,
# the latter may be used for local directories served by the web server. If
# your system is serving content from a sub-directory in /srv you must allow
# access here, or in any related virtual host.
<Directory />
      Options FollowSymLinks
      AllowOverride None
      Require all denied
</Directory>

<Directory /usr/share>
     AllowOverride None
     Require all granted
</Directory>

<Directory /var/www/>
      Options Indexes FollowSymLinks
      AllowOverride None
      Require all granted
</Directory>

#<Directory /srv/>

#<Directory /srv/>
#       Options Indexes FollowSymLinks
#       AllowOverride None
#       Require all granted
#</Directory>




# AccessFileName: The name of the file to look for in each directory
# for additional configuration directives.  See also the AllowOverride
# directive.
#
AccessFileName .htaccess

#
# The following lines prevent .htaccess and .htpasswd files from being
# viewed by Web clients.
#
<FilesMatch "^\.ht">
        Require all denied
</FilesMatch>

Further, below section is different in vanila than my current config:

# Include of directories ignores editors' and dpkg's backup files,
# see README.Debian for details.

# Include generic snippets of statements
IncludeOptional conf-enabled/*.conf
#vanilla OS 6# Include conf.d/

# Include the virtual host configurations:
IncludeOptional sites-enabled/*.conf
#vanilla OS 6# Include sites-enabled/

Changing my apache2.conf file to the one from vanilla OS 6 (disabling via # comment the section above and changing the IncludeOptional directives to the Include directives) leads to apache2 not being able to start anymore with the following error message:

Job for apache2.service failed because the control process exited with error code.
See "systemctl status apache2.service" and "journalctl -xe" for details.
root@NASty:/etc/apache2# systemctl status apache2.service
● apache2.service - The Apache HTTP Server
   Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
  Drop-In: /lib/systemd/system/apache2.service.d
           └─forking.conf
   Active: failed (Result: exit-code) since Sat 2017-05-27 12:27:14 CEST; 7s ago
  Process: 27739 ExecStart=/usr/sbin/apache2 $OPTIONS -k start (code=exited, status=1/FAILURE)
  Process: 27628 ExecStartPre=/frontview/bin/fvapps (code=exited, status=0/SUCCESS)
 Main PID: 19485 (code=exited, status=0/SUCCESS)

May 27 12:27:14 NASty systemd[1]: Starting The Apache HTTP Server...
May 27 12:27:14 NASty apache2[27739]: apache2: Syntax error on line 217 of /etc/apache2/apache2.conf: Syntax error on
 line 10 of /etc/apache2/conf.d/FSSHARE_data: Syntax error on line 2 of /etc/frontview/apache/Auth.conf: Cannot load
/usr/lib/apache2/modules/mod_privsep.so into server: /usr/lib/apache2/modules/mod_privsep.so: cannot open shared obje
ct file: No such file or directory
May 27 12:27:14 NASty systemd[1]: apache2.service: Control process exited, code=exited status=1
May 27 12:27:14 NASty systemd[1]: Failed to start The Apache HTTP Server.
May 27 12:27:14 NASty systemd[1]: apache2.service: Unit entered failed state.
May 27 12:27:14 NASty systemd[1]: apache2.service: Triggering OnFailure= dependencies.
May 27 12:27:14 NASty systemd[1]: apache2.service: Failed with result 'exit-code'.

The file /usr/lib/apache2/modules/mod_privsep.so is indeed missing.

Could this be the reason why my setup is no longer working? Any ideas on how to install or build this module?

Thank you very much for your support!