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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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
here
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): 23.0.12
Operating system and version (eg, Ubuntu 20.04): Ovh Webhost
Apache or nginx version (eg, Apache 2.4.25): replace me
PHP version (eg, 7.4): 7.3.33
The issue you are facing:
Since I’ve updated my NC instance from NC22 to NC23, my dav accesses don’t work anymore (caldav, cardav from DavX5 and lightning, file sync from desktop and android app).
The admin/settings panel tels me:
There are some errors regarding your setup.
Your web server is not yet properly set up to allow file synchronization, because the WebDAV interface seems to be broken.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Upgrade from NC22 to NC23 using web updater
The output of your Nextcloud log in Admin > Logging:
[webdav] Fatal: ParseError: syntax error, unexpected 'AttributeMap' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST)
PROPFIND /remote.php/dav/files/user/
from ***.***.***.*** at 2023-04-04T13:36:47+00:00
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '****',
'passwordsalt' => '****',
'secret' => '****',
'trusted_domains' =>
array (
0 => '****.fr',
),
'datadirectory' => '/home/domainedng/cloud/data',
'overwrite.cli.url' => 'https://****.fr',
'dbtype' => 'mysql',
'version' => '23.0.12.2',
'dbname' => '****',
'dbhost' => '.mysql.db',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => '****',
'dbpassword' => '****',
'installed' => true,
'overwriteprotocol' => 'https',
'memcache.local' => '\\OC\\Memcache\\ArrayCache',
'theme' => '',
'loglevel' => 0,
'maintenance' => false,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtphost' => 'SSL0.OVH.NET',
'mail_smtpauth' => 1,
'mail_smtpport' => '465',
'mail_smtpname' => 'noreply@****.fr',
'mail_smtppassword' => '****',
'mail_domain' => '****.fr',
'mail_from_address' => 'noreply',
'updater.secret' => '****',
'app_install_overwrite' =>
array (
0 => 'occweb',
1 => 'social',
),
'has_rebuilt_cache' => true,
'mysql.utf8mb4' => false,
);
The output of your Apache/nginx/system log in /var/log/____:
***.***.***.*** ****.fr - [04/Apr/2023:15:39:47 +0200] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 487 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/111.0"
***.***.***.*** ****.fr - [04/Apr/2023:15:39:53 +0200] "GET /status.php HTTP/1.1" 200 172 "-" "Mozilla/5.0 (Windows) mirall/3.4.1stable-Win64 (build 20211221) (Nextcloud, windows-10.0.17763 ClientArchitecture: x86_64 OsArchitecture: x86_64)"
***.***.***.*** ****.fr - [04/Apr/2023:15:39:53 +0200] "PROPFIND /remote.php/dav/files/user/ HTTP/1.1" 503 316 "-" "Mozilla/5.0 (Windows) mirall/3.4.1stable-Win64 (build 20211221) (Nextcloud, windows-10.0.17763 ClientArchitecture: x86_64 OsArchitecture: x86_64)"
[Tue Apr 04 15:34:09 2023] [error] [client ***.***.***.***] [host ****.fr] (104)Connection reset by peer: AH00574: ap_content_length_filter: apr_bucket_read() failed
[Tue Apr 04 15:34:43 2023] [error] [client ***.***.***.***] [host ****.fr] (104)Connection reset by peer: AH00574: ap_content_length_filter: apr_bucket_read() failed
[Tue Apr 04 15:35:12 2023] [error] [client ***.***.***.***] [host ****.fr] (104)Connection reset by peer: AH00574: ap_content_length_filter: apr_bucket_read() failed