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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): 26.0.0.11
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04 / docker
Apache or nginx version (eg, Apache 2.4.25): nginx
PHP version (eg, 7.4): replace me
The issue you are facing:
Get a warning in the admin panel that the cron job was not executed for several hours.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Got the warning message:
You are accessing your instance over a secure connection, but your instance is generating insecure URLs. This most likely means that you are behind a reverse proxy and the override configuration variables are not set correctly. Please read the documentation on this .
(translated from German)
I read the docu, but surely got something wrong.
Just for clarification: I am using docker container for database, nextcloud and reverse-proxy.
-
The config is below. Had to replace som parts by XX
-
Config of the nginx reverse proxy is:
server {
listen 443 ssl;
listen [::]:443;
#include snippets/self-signed.conf;
#include snippets/ssl-params.conf;
include letsencrypt.conf;
server_name bardhome.de;
location / {
proxy_read_timeout 1800;
proxy_connect_timeout 1800;
proxy_send_timeout 1800;
send_timeout 1800;
add_header Strict-Transport-Security "max-age=15552000; includeSubDomains" always;
proxy_buffering off;
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded-Proto https;
client_max_body_size 25G;
proxy_pass http://nextcloud;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
location ^~ /.well-known {
# The rules in this block are an adaptation of the rules
# in `.htaccess` that concern `/.well-known`.
location = /.well-known/carddav { return 301 /remote.php/dav/; }
location = /.well-known/caldav { return 301 /remote.php/dav/; }
location /.well-known/acme-challenge { try_files $uri $uri/ =404; }
location /.well-known/pki-validation { try_files $uri $uri/ =404; }
# Let Nextcloud's API for `/.well-known` URIs handle all other
# requests by passing them to the front-end controller.
The output of your Nextcloud log in Admin > Logging:
not relevant
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'passwordsalt' => 'XX',
'secret' => '+XX',
'trusted_domains' =>
array (
0 => 'localhost',
5 => 'nextcloudpi.local',
7 => 'nextcloudpi',
8 => 'nextcloudpi.lan',
1 => '172.18.0.6',
6 => '192.168.103.44',
20 => 'cloud.XX.de',
12 => 'XX.de',
21 => 'XX.spdns.de',
22 => '192.168.103.44',
11 => '79.244.33.204',
3 => 'dbe5e509ecaf',
14 => 'dbe5e509ecaf',
'' => '01f946771284',
15 => '79.244.33.204',
),
'dbtype' => 'mysql',
'version' => '26.0.0.11',
'dbname' => 'nextcloud',
'dbhost' => 'nc_mariadb',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'simon',
'dbpassword' => 'XX#Q',
'installed' => true,
'instanceid' => 'XX',
'overwrite.cli.url' => 'https://XX.de',
'default_phone_region' => 'DE',
'trusted_proxies' =>
array (
0 => '192.168.103.44',
2 => '127.0.0.1',
1 => 'localhost',
11 => '127.0.0.1',
12 => '::1',
13 => 'dbe5e509ecaf',
14 => '172.18.0.6',
15 => '79.244.33.204',
The output of your Apache/nginx/system log in /var/log/____:
not relevant
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.
not relevant