[Solved] CardBook reports Connection Test Failure

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Nextcloud version (eg, 12.0.2): 14.0.3
Operating system and version (eg, Ubuntu 17.04): Alpine Linux 3.8
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.14.0
PHP version (eg, 7.1): 7.2.11

The issue you are facing:
I want to add NC address book in CardBook (Thunderbird) following the instructions in the guide.
However connection test in CardBook fails.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Create app password in user settings -> security
  2. Confirm created user app password
  3. Start connection to NC’s address book using user account + app password

The output of your Nextcloud log in Admin > Logging:

No server logs available

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'passwordsalt' => 'DXBA0P/zwcxxxxxxxxxxxxxxxxxxxx',
  'secret' => 'FHn9DNilPSXs0azIC4xuZQw5DDBQxxxxxxxxxxxxxxxxxxxx',
  'trusted_domains' => 
  array (
    0 => '<mydomain>.de',
  ),
  'apps_paths' => 
  array (
    0 => 
    array (
      'path' => '/var/www/nextcloud/apps',
      'url' => '/apps',
      'writable' => true,
    ),
  ),
  'datadirectory' => '/var/lib/nextcloud/data',
  'logfile' => '/var/log/nextcloud//nextcloud.log',
  'loglevel' => 2,
  'knowledgebaseenabled' => true,
  'check_for_working_htaccess' => false,
  'dbtype' => 'mysql',
  'version' => '14.0.3.0',  
  'overwrite.cli.url' => 'https://<mydomain>.de',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nc',
  'dbpassword' => 'xxxxxxxxxxxx',
  'installed' => true,
  'mail_from_address' => 'admin',
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_domain' => '<FQHN>',
  'mail_smtpsecure' => 'tls',
  'mail_smtpauth' => 1,
  'mail_smtphost' => 'smtp.gmail.com',
  'mail_smtpport' => '587',
  'mail_smtpname' => '<user>',
  'mail_smtppassword' => '<password>',
  'instanceid' => 'xxxxxxxxxxx',
  'maintenance' => false,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => '/run/redis/redis.sock',
    'port' => 0,
    'timeout' => 0,
  ),
);

The output of your Apache/nginx/system log in /var/log/____:

nothing relevant

The application CardBook is reporting this error:

https://<mydomain>.de/remote.php/dav/addressbooks/users/<account>/contacts/ 
[HTTP/1.1 503 Service Unavailable 31ms]
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Cache-Controlno-store, no-cache, must-revalidateConnectioncloseContent-Security-Policydefault-src 'self'; script-src 'self' 'unsafe-eval' 'nonce-TW8zQ2w1R0dIWmt3SlZ6QVpJNHprMDZoemNtWHVhaHB4QUpOZ1dkZHVXUT06Zjg2SXpxQzBkY3BFVHl1ckh2bDNwRHlRL2Z2RzdNRTZoem9MMFFsdDhnbz0='; style-src 'self' 'unsafe-inline'; frame-src *; img-src * data: blob:; font-src 'self' data:; media-src *; connect-src *; object-src 'none'; base-uri 'self';Content-Typetext/html; charset=UTF-8DateSat, 27 Oct 2018 11:52:21 GMTExpiresThu, 19 Nov 1981 08:52:00 GMTPragmano-cacheServernginxSet-Cookie__Host-nc_sameSiteCookielax=true; path=/; httponly;secure; expires=Fri, 31-Dec-2100 23:59:59 GMT; SameSite=laxSet-Cookie__Host-nc_sameSiteCookiestrict=true; path=/; httponly;secure; expires=Fri, 31-Dec-2100 23:59:59 GMT; SameSite=strictStrict-Transport-Securitymax-age=15768000Transfer-EncodingchunkedX-Frame-OptionsSAMEORIGIN
Accept*/*Accept-Encodinggzip, deflate, brAccept-Languagede,en-US;q=0.7,en;q=0.3AuthorizationBasic dGhvbWFzOmlGNEprLTRhTm95LWNQbVJ0LUdkOUtULU5vQ055Connectionkeep-aliveContent-Length128Cookieochentz7kvhd=d620emojeqmq6gutaill01gvo7; oc_sessionPassphrase=b%2Fjbfd%2BuZzAtoQZ0fg6DhdQarpzM8ODB8e6vMmE0E2sMnIvVBeoINsVrfXwKq6zibAzhPUWrENSNF%2FUncQG9UcPcq2oRWRbbQM5toCNIYmjAGn8eUcNh3ul7MXMBrpta; SERVERID=srv03Host<mydomain>.deUser-AgentThunderbird CardBook/32.5 Lightning/6.2.2.1content-typeapplication/xml; charset=utf-8depth1
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