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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, 20.0.5): 28.0.3
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04.4 LTS
Apache or nginx version (eg, Apache 2.4.25): nginx reverse proxy nginx/1.18.0
PHP version (eg, 7.4): replace me
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
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 (
'htaccess.RewriteBase' => '/',
'memcache.local' => '\\OC\\Memcache\\APCu',
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'upgrade.disable-web' => true,
'instanceid' => 'i removed for now',
'passwordsalt' => 'i removed for now',
'secret' => 'i removed for now',
'trusted_domains' =>
array (
0 => '172.24.8.5:8080',
1 => '172.26.8.246',
2 => 'example.cac.queensu.ca',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'mysql',
'version' => '28.0.3.2',
'overwrite.cli.url' => 'https://example.cac.queensu.ca',
'dbname' => 'db',
'dbhost' => 'db',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'i removed for now',
'dbpassword' => 'i removed for now',
'installed' => true,
'mail_from_address' => 'i removed for now',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'i removed for now.ca',
'mail_smtphost' => 'i removed for now',
'mail_smtpport' => '25',
'defaultapp' => '',
'updater.release.channel' => 'stable',
// Configuration for trusted proxies
'trusted_proxies' => ['i removed for now'],
// Overwrite parameters for reverse proxy
'overwritehost' => 'example.cac.queensu.ca',
'overwriteprotocol' => 'https',
'overwritewebroot' => '/',
);
The output of your Apache/nginx/system log in /var/log/____:
2024/04/01 16:34:50 [error] 538913#538913: *8797 access forbidden by rule, client: 172.24.8.5, server: mission.cac.queensu.ca, request: "HEAD /apps/settings/js/esm-test.mjs HTTP/1.1", host: "example.cac.queensu.ca"
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.
PASTE HERE
