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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 22.0.0
Operating system and version (eg, Ubuntu 20.04): Debian 10
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.38
PHP version (eg, 7.4): 7.4 FPM
Client Version: Window 10 - 3.2.4
The issue you are facing:
Window10 Client is not synching with Nextcloud Server.
Due to a server change I had to reinstall Nextcloud new on my new server. I didn’t make a backup of the files because I wanted to do a fresh start.
Installing Nextcloud on my server was not the problem. The installation passed all checks.
Everything worked fine on the old server. I try to get Nextcloud running with the client for the last two days and to be honest, I am very close on giving up. I completly reinstalled Nextcloud again, but it didn’t help.
What’s very strange: The first time I opend the client and logged in, it synched. Afterwards, nope.
If I log out of the client and log in again, it’s synching one time and then it stoppes.
Is this the first time you’ve seen this error? (Y/N): No, doesn’t work since a fresh install of Nextcloud incl. client was done
Steps to replicate it:
- Add or delete a file in the Nextcloud-Folder on the local machine
- Client says “preparing to sync” and doesn’t do anything
The output of your Nextcloud log in Admin > Logging:
{"reqId":"WC4ZtdZMc01bsVSfU6mP","level":2,"time":"2021-07-18T11:14:31+00:00","remoteAddr":"79.225.188.241","user":"m.michalski@bothsides.de","app":"no app in context","method":"GET","url":"/index.php/core/preview?fileId=31&x=32&y=32","message":"Host fe80::8e89:a5ff:fe1d:278e was not connected to because it violates local access rules","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0) Gecko/20100101 Firefox/89.0","version":"22.0.0.11","id":"60f41d137eff9"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxxxxx',
'passwordsalt' => 'xxxxxxx',
'secret' => 'xxxxx',
'trusted_domains' =>
array (
0 => 'nextcloud.bothsides.de',
),
'datadirectory' => '/var/www/nextcloud-data',
'dbtype' => 'mysql',
'version' => '22.0.0.11',
'overwrite.cli.url' => 'https://nextcloud.bothsides.de',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '3306',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxxxxx',
'dbpassword' => 'xxxxxxxxx',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'xxxx',
'mail_domain' => 'xxxxx',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'xxxxxxxx'
'mail_smtpport' => '465',
'mail_smtpname' => 'xxxxxxx',
'mail_smtppassword' => 'xxxxxx',
'memcache.distributed' => '\OC\Memcache\Redis',
'memcache.local' => '\OC\Memcache\Redis',
'memcache.locking' => '\OC\Memcache\Redis',
'redis' => array(
'host' => 'localhost',
'port' => 6379,
),
'default_phone_region' => 'DE',
);
The output of your Apache/nginx/system log in /var/log/____:
[Sun Jul 18 15:14:14.726527 2021] [access_compat:error] [pid 14809] [client 79.225.188.241:63566] AH01797: client denied by server configuration: /var/www/nextcloud/config
This seems to be the problem, but I can’t find a solution
This is also my vhost config:
<VirtualHost *:80>
ServerAdmin webmaster
DocumentRoot /var/www/nextcloud
ServerSignature Off
ServerName nextcloud.xxxxx.de
Redirect permanent / https://nextcloud.xxxx.de/
<Directory "/var/www/nextcloud">
Options FollowSymLinks MultiViews
Require all granted
AllowOverride all
<IfModule mod_dav.c>
Dav off
</IfModule>
SetEnv HOME /var/www/nextcloud
SetEnv HTTP_HOME /var/www/nextcloud
Satisfy Any
</Directory>
<FilesMatch \.php$>
SetHandler "proxy:unix:/run/php/php7.4-fpm.sock|fcgi://localhost"
</FilesMatch>
ErrorLog ${APACHE_LOG_DIR}/nextcloud.error
CustomLog ${APACHE_LOG_DIR}/nextcloud.access combined
</VirtualHost>
<VirtualHost *:443>
ServerAdmin webmaster
DocumentRoot /var/www/nextcloud
ServerSignature Off
ServerName nextcloud.xxxx.de
<Directory "/var/www/nextcloud">
Options FollowSymLinks MultiViews
Require all granted
AllowOverride all
<IfModule mod_dav.c>
Dav off
</IfModule>
SetEnv HOME /var/www/nextcloud
SetEnv HTTP_HOME /var/www/nextcloud
Satisfy Any
</Directory>
<FilesMatch \.php$>
SetHandler "proxy:unix:/run/php/php7.4-fpm.sock|fcgi://localhost"
</FilesMatch>
SSLEngine on
SSLCertificateFile "/etc/letsencrypt/xxxx/fullchain.pem"
SSLCertificateKeyFile "/etc/letsencryptxxxx/privkey.pem"
<IfModule mod_headers.c>
Header always set Strict-Transport-Security "max-age=31536000"
</IfModule>
ErrorLog ${APACHE_LOG_DIR}/nextcloud.error
CustomLog ${APACHE_LOG_DIR}/nextcloud.access combined
</VirtualHost>
I can’t find anything what could prevent the client to connect to the Nextcloud. Especially if it works once after logout and login.
Any help is really appreciated.
Thanks!
Markus