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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, 12.0.2): 15.0.2
Operating system and version (eg, Ubuntu 17.04): ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): apache 2.4.29
PHP version (eg, 7.1): 7.2.10
The issue you are facing:
/settings/admin/overview page shows
- Dein Web-Server ist nicht richtig eingerichtet um “/.well-known/caldav” aufzulösen. Weitere Informationen findest Du in der Dokumentation.
- Dein Web-Server ist nicht richtig eingerichtet um “/.well-known/carddav” aufzulösen. Weitere Informationen findest Du in der Dokumentation.
Browser Developer Console (Chrome) shows following error:
overview:1 Refused to connect to ‘http://xx.xxxxxxxx.de/remote.php/dav/’ because it violates the following Content Security Policy directive: “connect-src ‘self’”.
headers from /settings/admin/overview in my browser:
content-security-policy:
default-src ‘none’;base-uri ‘none’;manifest-src ‘self’;script-src ‘nonce-TWorc0V6MGtSODlPdFVDVlFFSnpqZjhLRVFEakpNelFnc3JiRGZzLzAvND06Zmt2TkpRcGlGWjBleFRuZUt3VXJ6cG9oZGtqU2RZMjN6Nm4wUmJodzVLMD0=’;style-src ‘self’ ‘unsafe-inline’;img-src ‘self’ data: blob:;font-src ‘self’ data:;connect-src ‘self’;media-src ‘self’;frame-src https://xx.xxxxxxxxx.de
I see there is a http and not https request uri to /remote.php/dav/. i don’t know where it comes from. All things are working to client with https
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- Login as Admin
- Move to Settings -> Overview Page
The output of your Nextcloud log in Admin > Logging:
nothing to show
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxxxxxx',
'passwordsalt' => 'xxxxxxxxx',
'secret' => 'xxxxxxxxx',
'trusted_domains' =>
array (
0 => 'xx.xxxxxxx.de',
1 => 'xx.xxxxxxx.de.',
),
'trusted_proxies' => ['10.0.2.3'],
'overwriteprotocol' => 'https',
'datadirectory' => '/var/www/html/data',
'overwrite.cli.url' => 'https://xxxxxxx/',
'htaccess.RewriteBase' => '/',
'dbtype' => 'mysql',
'version' => '15.0.2.0',
'dbname' => 'xxxxxx',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'xxxxxx',
'dbpassword' => 'xxxxxxx',
'logtimezone' => 'UTC',
'installed' => true,
'mail_from_address' => 'nextcloud',
'mail_smtpmode' => 'sendmail',
'mail_domain' => 'xxxxxx.xx',
'mail_smtpsecure' => 'tls',
'mail_smtphost' => 'xxxxxxe',
'mail_smtpauth' => 1,
'mail_smtpauthtype' => 'PLAIN',
'mail_smtpname' => 'xxxxxx',
'mail_smtppassword' => 'xxxxxx',
'mail_smtpport' => '587',
'appstore.experimental.enabled' => false,
'loglevel' => 0,
'maintenance' => false,
'theme' => '',
'enable_previews' => true,
'preview_max_x' => NULL,
'preview_max_y' => NULL,
'preview_max_scale_factor' => 1,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0,
),
);
The output of your Apache/nginx/system log in /var/log/____:
access_oc.log:xxxxxxxx 10.0.2.3 - - [16/Jan/2019:12:50:55 +0000] "PROPFIND /.well-known/caldav HTTP/1.1" 301 546 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36"
access_oc.log:xxxxxxxx 10.0.2.3 - - [16/Jan/2019:12:50:55 +0000] "PROPFIND /.well-known/carddav HTTP/1.1" 301 546 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36"
haproxy config:
frontend outer_web
bind 10.0.2.3:80
bind fd99:0:0:2:216:3eff:fe09:7675:80
bind 10.0.2.3:443 ssl crt-list /etc/haproxy/crt-list.txt alpn h2,http/1.1
bind fd99:0:0:2:216:3eff:fe09:7675:443 ssl crt-list /etc/haproxy/crt-list.txt alpn h2,http/1.1
mode http
option forwardfor
compression algo gzip
compression type text/html text/plain text/css
http-request set-header X-Forwarded-Proto https if { ssl_fc }
acl le-acl path_beg /.well-known/acme-challenge/
acl host_de_xxxxxx_oc hdr(host) -m beg -i oc.xxxxxx.de
use_backend backend_le if le-acl
use_backend backend_de_xxxxxx_oc if host_de_xxxxxxxx_oc
backend backend_de_xxxxxxx_oc
mode http
#compression offload
http-response set-header Strict-Transport-Security max-age=16000000;\ includeSubDomains;\ preload;
redirect scheme https if !{ ssl_fc }
server vB02-de-xxxxxx-oc 10.0.2.12:81