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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, 29.0.5): 29.0.2 (Nextcloud AIO v9.0.1)
Operating system and version (eg, Ubuntu 29.04): Arch
Apache or nginx version (eg, Apache 2.4.25): AIO
PHP version (eg, 8.3): AIO
The issue you are facing:
With only AAAA records pointing to my server, administration / overview shows
Could not check that the data directory is protected. Please check manually that your server does not allow access to the data directory. To allow this check to run you have to make sure that your webserver can connect to itself. Therefor it must be able to resolve and connect to at least one its `trusted_domains` or the `overwrite.cli.url`.
Your webserver is not set up to serve `.js.map` files. Without these files, JavaScript Source Maps won't function properly, making it more challenging to troubleshoot and debug any issues that may arise.
Could not check for JavaScript support via any of your `trusted_domains` nor `overwrite.cli.url`. This may be the result of a server-side DNS mismatch or outbound firewall rule. Please check manually if your webserver serves `.mjs` files using the JavaScript MIME type. To allow this check to run you have to make sure that your webserver can connect to itself. Therefor it must be able to resolve and connect to at least one its `trusted_domains` or the `overwrite.cli.url`.
Could not check if your web server properly resolves the OCM and OCS provider URLs. To allow this check to run you have to make sure that your webserver can connect to itself. Therefor it must be able to resolve and connect to at least one its `trusted_domains` or the `overwrite.cli.url`.
Could not check that your web server is properly set up to allow file synchronization over WebDAV. Please check manually. To allow this check to run you have to make sure that your webserver can connect to itself. Therefor it must be able to resolve and connect to at least one its `trusted_domains` or the `overwrite.cli.url`. For more details see the documentation ↗.
Could not check that your web server serves `.well-known` correctly. Please check manually. To allow this check to run you have to make sure that your webserver can connect to itself. Therefor it must be able to resolve and connect to at least one its `trusted_domains` or the `overwrite.cli.url`. For more details see the documentation ↗.
Could not check for WOFF2 loading support. Please check manually if your webserver serves `.woff2` files. To allow this check to run you have to make sure that your webserver can connect to itself. Therefor it must be able to resolve and connect to at least one its `trusted_domains` or the `overwrite.cli.url`. For more details see the documentation ↗.
Could not check that your web server serves security headers correctly. Please check manually. For more details see the documentation ↗.
while with A records all checks pass. The server is otherwise fully operational with or without A records.
Is this the first time you’ve seen this error? (Y/N): Y although didn’t try IPv6-only before
Steps to replicate it:
- remove A records
- wait for DNS to propagate
- refresh administration / overview
The output of your Nextcloud log in Admin > Logging:
The logs are currently full of unrelated errors due to recent network outage (firewall misconfiguration to be precise). During the testing period of 2 days, a single kind of message repeated over and over:
{"reqId":"2p0sBVro45MMrPO9h4PB","level":3,"time":"2024-06-25T21:26:11+00:00","remoteAddr":"","user":"--","app":"richdocuments","method":"","url":"--","message":"Failed to fetch discovery: cURL error 7: Failed to connect to nextcloud.<my domain> port 443 after 4 ms: Couldn't connect to server (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.<my domain>/hosting/discovery","userAgent":"--","version":"29.0.2.2","exception":{"Exception":"GuzzleHttp\\Exception\\ConnectException","Message":"cURL error 7: Failed to connect to nextcloud.<my domain> port 443 after 4 ms: Couldn't connect to server (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.<my domain>/hosting/discovery","Code":0,"Trace":[{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":158,"function":"createRejection","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":110,"function":"finishError","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":[["GuzzleHttp\\Handler\\CurlHandler"],"*** sensitive parameters replaced ***",["GuzzleHttp\\Handler\\CurlFactory"]]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php","line":47,"function":"finish","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":[["GuzzleHttp\\Handler\\CurlHandler"],"*** sensitive parameters replaced ***",["GuzzleHttp\\Handler\\CurlFactory"]]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":142,"function":"__invoke","class":"GuzzleHttp\\Handler\\CurlHandler","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/lib/private/Http/Client/DnsPinMiddleware.php","line":123,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php","line":35,"function":"OC\\Http\\Client\\{closure}","class":"OC\\Http\\Client\\DnsPinMiddleware","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":31,"function":"__invoke","class":"GuzzleHttp\\PrepareBodyMiddleware","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php","line":71,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":66,"function":"__invoke","class":"GuzzleHttp\\RedirectMiddleware","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php","line":75,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Client.php","line":333,"function":"__invoke","class":"GuzzleHttp\\HandlerStack","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Client.php","line":169,"function":"transfer","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Client.php","line":189,"function":"requestAsync","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/lib/private/Http/Client/Client.php","line":230,"function":"request","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***","https://nextcloud.<my domain>/hosting/discovery",["/mnt/ncdata/files_external/rootcerts.crt",5,[true],["Nextcloud Server Crawler","gzip"],true]]},{"file":"/var/www/html/custom_apps/richdocuments/lib/Service/DiscoveryService.php","line":75,"function":"get","class":"OC\\Http\\Client\\Client","type":"->","args":["https://nextcloud.<my domain>/hosting/discovery",[5,[true]]]},{"file":"/var/www/html/custom_apps/richdocuments/lib/Service/CachedRequestService.php","line":75,"function":"sendRequest","class":"OCA\\Richdocuments\\Service\\DiscoveryService","type":"->","args":[["OC\\Http\\Client\\Client"]]},{"file":"/var/www/html/custom_apps/richdocuments/lib/Backgroundjobs/ObtainCapabilities.php","line":52,"function":"fetch","class":"OCA\\Richdocuments\\Service\\CachedRequestService","type":"->","args":[]},{"file":"/var/www/html/lib/public/BackgroundJob/Job.php","line":80,"function":"run","class":"OCA\\Richdocuments\\Backgroundjobs\\ObtainCapabilities","type":"->","args":[null]},{"file":"/var/www/html/lib/public/BackgroundJob/TimedJob.php","line":102,"function":"start","class":"OCP\\BackgroundJob\\Job","type":"->","args":[["OC\\BackgroundJob\\JobList"]]},{"file":"/var/www/html/lib/public/BackgroundJob/TimedJob.php","line":92,"function":"start","class":"OCP\\BackgroundJob\\TimedJob","type":"->","args":[["OC\\BackgroundJob\\JobList"]]},{"file":"/var/www/html/cron.php","line":176,"function":"execute","class":"OCP\\BackgroundJob\\TimedJob","type":"->","args":[["OC\\BackgroundJob\\JobList"]]}],"File":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","Line":210,"message":"Failed to fetch discovery: cURL error 7: Failed to connect to nextcloud.<my domain> port 443 after 4 ms: Couldn't connect to server (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.<my domain>/hosting/discovery","exception":[],"CustomMessage":"Failed to fetch discovery: cURL error 7: Failed to connect to nextcloud.<my domain> port 443 after 4 ms: Couldn't connect to server (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.<my domain>/hosting/discovery"},"id":"667c7488ee27f"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'one-click-instance' => true,
'one-click-instance.user-limit' => 100,
'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,
),
),
'check_data_directory_permissions' => false,
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'nextcloud-aio-redis',
'password' => '',
'port' => 6379,
),
'passwordsalt' => '',
'secret' => '',
'trusted_domains' =>
array (
0 => 'localhost',
1 => 'nextcloud.<my domain>',
),
'datadirectory' => '/mnt/ncdata',
'dbtype' => 'pgsql',
'version' => '29.0.2.2',
'overwrite.cli.url' => 'https://nextcloud.<my domain>/',
'dbname' => 'nextcloud_database',
'dbhost' => 'nextcloud-aio-database',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_nextcloud',
'dbpassword' => '',
'installed' => true,
'instanceid' => '',
'maintenance' => false,
'loglevel' => 2,
'log_type' => 'file',
'logfile' => '/var/www/html/data/nextcloud.log',
'log_rotate_size' => '10485760',
'log.condition' =>
array (
'apps' =>
array (
0 => 'admin_audit',
),
),
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'enabledPreviewProviders' =>
array (
1 => 'OC\\Preview\\Image',
2 => 'OC\\Preview\\MarkDown',
3 => 'OC\\Preview\\MP3',
4 => 'OC\\Preview\\TXT',
5 => 'OC\\Preview\\OpenDocument',
6 => 'OC\\Preview\\Movie',
7 => 'OC\\Preview\\Krita',
0 => 'OC\\Preview\\Imaginary',
),
'enable_previews' => true,
'upgrade.disable-web' => true,
'mail_smtpmode' => 'smtp',
'trashbin_retention_obligation' => 'auto, 30',
'versions_retention_obligation' => 'auto, 30',
'activity_expire_days' => '30',
'simpleSignUpLink.shown' => false,
'share_folder' => '/Shared',
'one-click-instance.link' => 'https://nextcloud.com/all-in-one/',
'upgrade.cli-upgrade-link' => 'https://github.com/nextcloud/all-in-one/discussions/2726',
'updatedirectory' => '/nc-updater',
'htaccess.RewriteBase' => '/',
'files_external_allow_create_new_local' => true,
'trusted_proxies' =>
array (
0 => '127.0.0.1',
1 => '::1',
10 => '172.18.0.1/32',
),
'allow_local_remote_servers' => true,
'overwritehost' => 'nextcloud.<my domain>',
'overwriteprotocol' => 'https',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => '',
'mail_domain' => '<my domain>',
'mail_smtphost' => '',
'mail_smtpport' => '465',
'mail_smtpauth' => 1,
'mail_smtpname' => '',
'mail_smtppassword' => '',
'mail_smtpsecure' => 'ssl',
'default_phone_region' => 'AT',
'davstorage.request_timeout' => 3600,
'dbpersistent' => false,
'appsallowlist' => false,
'preview_imaginary_url' => 'http://nextcloud-aio-imaginary:9000',
'maintenance_window_start' => 100,
'preview_imaginary_key' => '',
'auth.bruteforce.protection.enabled' => true,
'ratelimit.protection.enabled' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
AIO
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.
see above