Always get "403 Forbidden" errors and ownCloud does NOT synchronize files

Good afternoon
I would very much like to get some help, but unfortunately I am NOT a computer specialists.
Most of the questions and replies I looked at in this forum, again “unfortunately”, are quite beyond me.
I do not really know, where to find most of the information you request, do all the highly technical
computer operations or run Linux commands.
So, maybe conclusion first: Do you have to be computer specialists with advanced technical knowledge
to use ownCloud? And are people like me (regular Joe) not supposed to go near it?
If so, I am really sorry to have asked.
The hosting service provider I use, does not offer support. Neither does the German company that created ownCloud,
or, in my case, the Japanese company supposed to be in charge of support here in Japan.

As a last resort I try this forum, but if my question (and me asking) is just too stupid,
please accept my apologies.

About 3 weeks ago I installed the ownCloud server offered by the hosting service for my website.
The installation went without errors.
Later I installed the desktop client on 2 Windows (Japanese edition) 10 desktop machines (one a workstation) and designated a local folder to be synchronized, but EVERY TIME the latest version is supposed to be uploaded to the server, I get error messages like:
Server replied “403 Forbidden” from “PUT” (skipped due to earlier error, trying again in 12 sec),Suhara-NEW/SuharaBuch.odt ,F:\ownCloud , ,Thomas,2022-02-26T15:17:34.914,Blacklisted

In the end ownCloud tells me it did/does not upload the latest file and I have to manually copy it to a USB stick.
This renders the whole idea of “file synchronization” rather useless.
I have been struggling with this for the last 3 weeks, several hours a day, but so far nothing I did had any effect.

Is there a way (preferably in plain English) to tackle this problem?

Here are a few pieced of information I found:
versionstring 10.7.0
Cron Last cron job execution: 12 days ago. Something seems wrong.
AJAX Execute one task with each page loaded
Webcron cron.php is registered at a webcron service to call cron.php every 15 minutes over http.
Cron Use system’s cron service to call the cron.php file every 15 minutes.
Does this point to any possible problem? Under “Cron” it says “something seems wrong”.
If there is a trick to get this thing running, I would be very grateful.
Thank you

Steps to reproduce

Expected behaviour

Tell us what should happen

Actual behaviour

Tell us what happens instead

Server configuration

Operating system:

Web server:


PHP version:

ownCloud version: (see ownCloud admin page)

Updated from an older ownCloud or fresh install:

Where did you install ownCloud from:

Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
paste the results into and puth the link here.

The content of config/config.php:

Log in to the web-UI with an administrator account and click on
'admin' -> 'Generate Config Report' -> 'Download ownCloud config report'
This report includes the config.php settings, the list of activated apps
and other details in a well sanitized form.


If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your ownCloud installation folder

*ATTENTION:* Do not post your config.php file in public as is. Please use one of the above
methods whenever possible. Both, the generated reports from the web-ui and from occ config:list
consistently remove sensitive data. You still may want to review the report before sending.
If done manually then it is critical for your own privacy to dilligently
remove *all* host names, passwords, usernames, salts and other credentials before posting.
You should assume that attackers find such information and will use them against your systems.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your ownCloud installation folder.

Are you using external storage, if yes which one: local/smb/sftp/…

Are you using encryption: yes/no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/…

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your ownCloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';

Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration


Operating system:


Web server error log

Insert your webserver log here

ownCloud log (data/owncloud.log)

Insert your ownCloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...

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