here i can see the `Apache Webpage´
so apache is working at least
and http://<your-ip-address>/nextcloud is giving an issue?
BTW: you have an additional challenge. PiHole doesn’t seems to be working. At least DNS port 53 is blocked by Unbound.
Can you check PiHole version
pihole -v
result from http://my_ip_adress/nextcloud
Forbidden
You don’t have permission to access this resource.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.
pihole is uninstalled
you have done this using dietpi-software?
yes with dietpi-software
i have a question. you speak german? it is possible you make online seminare for software packages an special points for install and working? so 20 , or 30 minutes for good price?
usually we have our online docs where everything is well documented. DietPi aims to do majority of installation steps end-to-end fully automated without user interaction. It’s not needed to do manual configurations.
And you might stay away from Google search and/or ChatGPT if you don’t know what you are doing 
Back to topic, can you share content of Apache config dir
/etc/apache2/sites-enabled
cd /etc/apache2/
root@Pi54G:/etc/apache2# ls -l
insgesamt 84
-rw-r--r-- 1 root root 7178 4. Okt 2024 apache2.conf
drwxr-xr-x 2 root root 4096 12. Feb 18:19 conf-available
drwxr-xr-x 2 root root 4096 12. Feb 18:19 conf-enabled
-rw-r--r-- 1 root root 1782 28. Sep 2024 envvars
-rw-r--r-- 1 root root 31063 23. Jul 2022 magic
drwxr-xr-x 2 root root 16384 10. Jan 16:44 mods-available
drwxr-xr-x 2 root root 4096 11. Feb 19:14 mods-enabled
-rw-r--r-- 1 root root 274 29. Sep 2024 ports.conf
drwxr-xr-x 2 root root 4096 12. Feb 18:19 sites-available
drwxr-xr-x 2 root root 4096 12. Feb 18:19 sites-enabled
root@Pi54G:/etc/apache2# cat ports.conf
# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default.conf
Listen 80
<IfModule ssl_module>
Listen 443
</IfModule>
<IfModule mod_gnutls.c>
Listen 443
</IfModule>
no sites-enable can i found
i found dietpi-nextcloud.conf:
# Based on: https://github.com/nextcloud/documentation/blob/33f6655c27163c6c0437cd41a6018f2b3665c7ac/admin_manual/installation/source_installation.rst#apache-web-server->
<Directory /var/www/nextcloud>
Require all granted
AllowOverride All
Options FollowSymLinks
<IfModule mod_dav.c>
Dav off
</IfModule>
</Directory>
# Redirect webfinger and nodeinfo requests to Nextcloud endpoint
Redirect 301 /.well-known/webfinger /nextcloud/index.php/.well-known/webfinger
Redirect 301 /.well-known/nodeinfo /nextcloud/index.php/.well-known/nodeinfo
it’s sites-enabled with a d at the end, not sites-enable
Wouldn’t it be easier to reinstall the Pi5 completely? I would just need to know which of the software packages I must not mix.
it is not a problem.
of course you can start from scratch. For Nextcloud you just need to select Nextcloud (ID 114). Nothing else is needed.
BTW: your system is DietPi version 9.7 from August 2024 as well as Debian Bookworm. Current version is v10 and latest Debian Trixie Starting from scratch will bump you into the future 
ok. what i need is LXDE(23), XRDP(29) webmin (115); vsftpd(95) , unbound( not realy), Wireguard (172 when is possible), nfs clinet(110)
they all not conflicting with each other
ok. so i will a clear system with nextcloud an wireguard ( but i have a second one)
many thanks for your support.
Hi , again , i have the new version of dietpi R.10 installed. nextcloud is runnimg but no login is possible, no login with dietpi user is possible.
must i a seperate new nextcloud user create?
You need to login as user admin.
See: https://dietpi.com/docs/software/cloud/#nextcloud
hi, ok thanks , is function .
BR Ralph