Login redirect loop

[/details]

Nextcloud version (eg, 12.0.2): 16.0.1
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.29
PHP version (eg, 7.1): 7.3

The issue you are facing:
When logging in , whether localhost or domain, I´m redirected to the login page regardless of the password. I think its kind of a php issue?

like ip/login?redirect_url=/apps/files/

but I´m still on the login page.

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

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

<?php
$CONFIG = array (
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => '',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    1 => 'example.com',
    
  ),
  'datadirectory' => '/home/rock64/nextcloud-files',
  'dbtype' => 'mysql',
  'version' => '16.0.1.1',
  'overwrite.cli.url' => 'https://example.com',
  'htaccess.RewriteBase' => '/',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => '',
  'dbpassword' => '',
  'installed' => true,
  'activity_expire_days' => 14,
  'auth.bruteforce.protection.enabled' => true,
  'blacklisted_files' =>
  array (
    0 => '.htaccess',
    1 => 'Thumbs.db',
    2 => 'thumbs.db',
  ),
  'cron_log' => true,
  'enable_previews' => true,
  'enabledPreviewProviders' =>
  array (
    0 => 'OC\\Preview\\PNG',
    1 => 'OC\\Preview\\JPEG',
    2 => 'OC\\Preview\\GIF',
    3 => 'OC\\Preview\\BMP',
    4 => 'OC\\Preview\\XBitmap',
    5 => 'OC\\Preview\\Movie',
    6 => 'OC\\Preview\\PDF',
    7 => 'OC\\Preview\\MP3',
    8 => 'OC\\Preview\\TXT',
    9 => 'OC\\Preview\\MarkDown',
  ),
  'filesystem_check_changes' => 0,
  'filelocking.enabled' => 'true',
  'integrity.check.disabled' => false,
  'knowledgebaseenabled' => false,
  'logfile' => '/var/nc_data/nextcloud.log',
  'loglevel' => 2,
  'logtimezone' => 'Europe/Berlin',
  'log_rotate_size' => 104857600,
  'maintenance' => false,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
 'preview_max_x' => 1024,
  'preview_max_y' => 768,
  'preview_max_scale_factor' => 1,
  'redis' =>
  array (
    'host' => '/var/run/redis/redis-server.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
  'quota_include_external_storage' => false,
  'share_folder' => '/Shares',
  'skeletondirectory' => '',
  'theme' => '',
  'trashbin_retention_obligation' => 'auto, 7',
  'updater.release.channel' => 'stable',
);

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

192.168.178.38 - - [22/Jun/2019:11:42:52 +0000] "GET / HTTP/1.1" 302 1011 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:52 +0000] "GET /login HTTP/1.1" 200 4854 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:52 +0000] "GET /apps/files_pdfviewer/css/style.css?v=35c36e89 HTTP/1.1" 200 795 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:52 +0000] "GET /core/css/guest.css?v=027c6098 HTTP/1.1" 200 6052 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /apps/files_pdfviewer/js/previewplugin.js?v=027c6098 HTTP/1.1" 200 2669 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /apps/files_videoplayer/js/main.js?v=027c6098 HTTP/1.1" 200 3259 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /apps/files_rightclick/l10n/de.js?v=027c6098 HTTP/1.1" 200 1073 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /apps/files_rightclick/js/script.js?v=027c6098 HTTP/1.1" 200 3652 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /apps/gallery/l10n/de.js?v=027c6098 HTTP/1.1" 200 4607 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /core/fonts/Nunito-Regular.woff2 HTTP/1.1" 200 20105 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /core/fonts/Nunito-Bold.woff2 HTTP/1.1" 200 20226 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /core/img/logo/logo.svg?v=1 HTTP/1.1" 200 827 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /core/img/background.png?v=2 HTTP/1.1" 200 103210 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /core/img/actions/confirm-white.svg?v=2 HTTP/1.1" 200 911 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /core/js/dist/share_backend.js?v=027c6098 HTTP/1.1" 200 22602 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /apps/accessibility/js/accessibility?v=0 HTTP/1.1" 200 1231 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /js/core/merged-login.js?v=027c6098 HTTP/1.1" 200 3691 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /js/core/merged-template-prepend.js?v=027c6098 HTTP/1.1" 200 24538 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /core/img/favicon.ico HTTP/1.1" 200 3747 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:11:42:53 +0000] "GET /core/img/favicon-touch.png HTTP/1.1" 200 3388 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:06 +0000] "GET /login HTTP/1.1" 200 4882 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:06 +0000] "GET /core/img/logo/logo.svg?v=1 HTTP/1.1" 200 827 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:06 +0000] "GET /core/img/background.png?v=2 HTTP/1.1" 304 192 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:06 +0000] "GET /core/fonts/Nunito-Bold.woff2 HTTP/1.1" 200 20253 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:06 +0000] "GET /core/img/actions/confirm-white.svg?v=2 HTTP/1.1" 200 938 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:06 +0000] "GET /core/fonts/Nunito-Regular.woff2 HTTP/1.1" 200 20105 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:07 +0000] "GET /core/img/favicon-touch.png HTTP/1.1" 200 3388 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:07 +0000] "GET /core/img/favicon.ico HTTP/1.1" 200 3747 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:17 +0000] "POST /login HTTP/1.1" 303 1108 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:17 +0000] "GET /apps/files/ HTTP/1.1" 303 1076 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:10:18 +0000] "GET /login?redirect_url=/apps/files/ HTTP/1.1" 200 4874 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"
192.168.178.38 - - [22/Jun/2019:12:22:19 +0000] "GET /csrftoken HTTP/1.1" 200 1165 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0"