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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
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, 28.1):
Operating system and version (eg, Ubuntu 22.04):
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 8.1): `
Since our move to nc 28.01, sharing no longer works.
When you connect to the sharing link, a blank page loops without ever succeeding.
The download button works well.
I would like to find a solution without having to reinstall everything.
Is this the first time you’ve seen this error? (Yes):
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '*******',
'passwordsalt' => '*********',
'datadirectory' => '/mnt/nextcloud/data',
'dbtype' => 'mysql',
'version' => '28.0.1.1',
'dbname' => 'nextcloud',
'dbhost' => 'm****************',
'dbtableprefix' => 'oc_',
'dbuser' => '************',
'dbpassword' => '***************',
'mysql.utf8mb4' => true,
'installed' => true,
'ldapIgnoreNamingRules' => false,
'logfile' => '/mnt/nextcloud/data/nextcloud.log',
'loglevel' => 3,
'logdateformat' => 'F d, Y H:i:s',
'logtimezone' => 'Europe/Paris',
'maintenance' => false,
'mail_smtpmode' => 'smtp',
'mail_smtphost' => 'm***************',
'mail_smtpport' => 25,
'mail_smtpauth' => false,
'memcache.local' => '\\OC\\Memcache\\Redis',
'filelocking.enabled' => 'true',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '******************',
'port' => 6379,
'user' => 'nextcloud',
'password' => '************************',
),
'trusted_domains' =>
array (
0 => 'u**************.fr',
),
'trusted_proxies' =>
array (
0 => '*************',
1 => '*******************',
2 => '***********',
3 => '************',
4 => '******************',
),
'forwarded-for-headers' =>
array (
0 => 'HTTP_X_FORWARDED_FOR',
),
'updatechecker' => false,
array (
0 => 'HTTP_X_FORWARDED_FOR',
),
'updatechecker' => false,
'secret' => '****************************************************',
'share_folder' => '/Shared',
'default_language' => 'fr',
'default_locale' => 'fr_FR',
'default_phone_region' => 'FR',
'trashbin_retention_obligation' => 'auto',
'cron_log' => true,
'overwrite.cli.url' => 'https://*****************',
'overwriteprotocol' => 'https',
'htaccess.RewriteBase' => '/',
'htaccess.IgnoreFrontController' => true,
'upgrade.disable-web' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
[Thu Feb 22 09:35:48.302509 2024] [proxy_fcgi:error] [pid 1248437:tid 139915866138176] (104)Connection reset by peer: [client 1****************:52398] AH01075: Error dispatching request to :
[Thu Feb 22 09:35:48.529317 2024] [proxy_fcgi:error] [pid 1248438:tid 139916828452416] [client 1****************:52400] AH01067: Failed to read FastCGI header
[Thu Feb 22 09:35:48.529352 2024] [proxy_fcgi:error] [pid 1248438:tid 139916828452416] (104)Connection reset by peer: [client 1****************:52400] AH01075: Error dispatching request to :
[Thu Feb 22 09:35:48.630044 2024] [proxy_fcgi:error] [pid 1248438:tid 139916033893952] [client 1****************:52410] AH01067: Failed to read FastCGI header
[Thu Feb 22 09:35:48.630075 2024] [proxy_fcgi:error] [pid 1248438:tid 139916033893952] (104)Connection reset by peer: [client 1****************:52410] AH01075: Error dispatching request to :
[Thu Feb 22 09:35:48.662137 2024] [proxy:error] [pid 1248438:tid 139916478510656] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /run/php/php8.1-fpm.sock (*) failed
[Thu Feb 22 09:35:48.662222 2024] [proxy_fcgi:error] [pid 1248438:tid 139916478510656] [client 1****************:52422] AH01079: failed to make connection to backend: httpd-UDS
[Thu Feb 22 09:35:48.684358 2024] [proxy:error] [pid 1248437:tid 139916428154432] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /run/php/php8.1-fpm.sock (*) failed
[Thu Feb 22 09:35:48.684410 2024] [proxy_fcgi:error] [pid 1248437:tid 139916428154432] [client 1****************:52426] AH01079: failed to make connection to backend: httpd-UDS
[Thu Feb 22 09:35:56.900552 2024] [access_compat:error] [pid 1248437:tid 139915471877696] [client 1****************:52450] AH01797: client denied by server configuration: /var/www/html/nextcloud/config
[Thu Feb 22 09:35:59.960872 2024] [access_compat:error] [pid 1248437:tid 139915329267264] [client 1****************:45026] AH01797: client denied by server configuration: /var/www/html/nextcloud/config
[Thu Feb 22 09:36:09.689148 2024] [access_compat:error] [pid 1248438:tid 139916453332544] [client 86.212.122.147:0] AH01797: client denied by server configuration: /var/www/html/nextcloud/config
[Thu Feb 22 09:42:35.609388 2024] [core:info] [pid 1248438:tid 139916059072064] [client 1****************:47020] AH00128: File does not exist: /var/www/html/nextcloud/favicon.ico, referer: https://uabox.univ-angers.fr/index.php/s/pBMWKXyuICxb8Mz
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
{"reqId":"imVZ44kYghhxzYPZYA8i","level":2,"time":"2024-02-15T12:17:13+00:00","remoteAddr":"1***********","user":"--","app":"no app in context","method":"GET","url":"/status.php","message":"Request does not pass strict cookie check","userAgent":"Mozilla/5.0 (Windows) mirall/3.12.0stable-Win64 (build 20240213) (Nextcloud, windows-10.0.19045 ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"","data":[]}
{"reqId":"DMyaUXeqfgguQBGY9fau","level":3,"time":"2024-02-15T12:18:04+00:00","remoteAddr":"1**********","user":"herve.lecorronc","app":"index","method":"GET","url":"/index.php/apps/theming/favicon?v=3aa1583a","message":"Could not create folder \"/appdata_oc8r5ao24a3n/theming/global\"","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0","version":"28.0.1.1","exception":{"Exception":"OCP\\Files\\NotPermittedException","Message":"Could not create folder \"/appdata_oc8r5ao24a3n/theming/global\"","Code":0,"Trace":[{"file":"/var/www/html/nextcloud/lib/private/Files/AppData/AppData.php","line":147,"function":"newFolder","class":"OC\\Files\\Node\\Folder","type":"->"},{"file":"/var/www/html/nextcloud/apps/theming/lib/ImageManager.php","line":367,"function":"newFolder","class":"OC\\Files\\AppData\\AppData","type":"->"},{"file":"/var/www/html/nextcloud/apps/theming/lib/ImageManager.php","line":101,"function":"getRootFolder","class":"OCA\\Theming\\ImageManager","type":"->"},{"file":"/var/www/html/nextcloud/apps/theming/lib/Controller/IconController.php","line":127,"function":"getImage","class":"OCA\\Theming\\ImageManager","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":230,"function":"getFavicon","class":"OCA\\Theming\\Controller\\IconController","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":137,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/App.php","line":184,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Route/Router.php","line":315,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/nextcloud/lib/base.php","line":1069,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/nextcloud/index.php","line":39,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/nextcloud/lib/private/Files/Node/Folder.php","Line":162,"message":"Could not create folder \"/appdata_oc8r5ao24a3n/theming/global\"","exception":{},"CustomMessage":"Could not create folder \"/appdata_oc8r5ao24a3n/theming/global\""}}
{"reqId":"uZk2rlYY9lFi9e89HPBH","level":2,"time":"2024-02-15T12:18:12+00:00","remoteAddr":"1**************","user":"--","app":"core","method":"PROPFIND","url":"/remote.php/dav/files/200002609/","message":"Login failed: 'laurent.daburon' (Remote IP: '193.49.144.242')","userAgent":"Mozilla/5.0 (Windows) mirall/2.3.1 (build 6824)","version":"28.0.1.1","data":{"app":"core"}}