Some clients cant open nextcloud (white screen)

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Some Clients cant access Nextcloud. Browser is loading endless and/or receiving a blank white page. This appears only to around 5% of users.

most people (including me) dont have any problems opening nextcloud from external hosts. Some just cant open any page. Any idea why or how to hunt this down? As i can see the client ip in apache logs, it does not seem as a routing problem…

Nextcloud version (eg, 29.0.5): 30.0.1.2
Operating system and version (eg, Ubuntu 24.04): Ubuntu 24.04
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 8.3): 8.2

The issue you are facing:
Some Clients cant access Nextcloud. Browser is loading endless and/or receiving a blanc white page. This appears only to around 5% of users. Even the home/ login screen is not displaying.

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

Steps to replicate it:

  1. find an affected user / workstation and try to open external nextcloud url.

The output of your Nextcloud log in Admin > Logging:

nothing special

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

<?php
$CONFIG = array (
  'apps_paths' =>
  array (
    0 =>
    array (
      'path' => '/snap/nextcloud/current/htdocs/apps',
      'url' => '/apps',
      'writable' => false,
    ),
    1 =>
    array (
      'path' => '/var/snap/nextcloud/current/nextcloud/extra-apps',
      'url' => '/extra-apps',
      'writable' => true,
    ),
  ),
  'supportedDatabases' =>
  array (
    0 => 'mysql',
  ),
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => '/tmp/sockets/redis.sock',
    'port' => 0,
  ),
  'log_type' => 'file',
  'logfile' => '/var/snap/nextcloud/current/logs/nextcloud.log',
  'logfilemode' => 416,
  'instanceid' => 'xxxx',
  'passwordsalt' => 'xxxxxx',
  'secret' => 'xxxxxx',
  'trusted_domains' =>
  array (
    0 => '192.168.231.8',
    1 => 'cloud.xxx.de',
    2 => '81.xxx.xxx.253',
  ),
  'datadirectory' => '/var/snap/nextcloud/common/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '30.0.1.2',
  'overwrite.cli.url' => 'cloud.xxx.de',
  'overwriteprotocol' => 'https',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost:/tmp/sockets/mysql.sock',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => 'xxx',
  'installed' => true,
  'mail_from_address' => 'no-reply',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_domain' => 'xxx.de',
  'mail_smtphost' => 'exchange.xxx.de',
  'mail_smtpport' => '587',
  'mail_smtpauthtype' => 'LOGIN',
  'maintenance' => false,
  'skeletondirectory' => '',
  'loglevel' => 2,
  'trashbin_retention_obligation' => 'auto, 14',
  'default_language' => 'de',
  'default_locale' => 'de_DE',
  'maintenance_window_start' => 1,
  'mail_smtpauth' => 1,
  'debug' => false,
);

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

176.6.56.146 - - - [31/Oct/2024:12:22:40 +0000] "GET / HTTP/1.1" 302 1134 "-" "Mozilla/5.0 (Android 12; Mobile; rv:131.0) Gecko/131.0 Firefox/131.0"
176.6.56.146 - - - [31/Oct/2024:12:22:41 +0000] "GET /index.php/login HTTP/1.1" 200 7983 "-" "Mozilla/5.0 (Android 12; Mobile; rv:131.0) Gecko/131.0 Firefox/131.0"

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.

none

i just noticed, that the nextcloud security scanner is not updating.
after “trigger re-scan” i find the following logs in apache_access.log

95.217.53.149 - - - [29/Oct/2024:18:53:57 +0000] "GET /owncloud/status.php HTTP/1.1" 301 463 "-" "scan.nextcloud.com"
95.217.53.149 - - - [29/Oct/2024:18:53:57 +0000] "GET /status.php HTTP/1.1" 301 445 "-" "scan.nextcloud.com"
95.217.53.149 - - - [29/Oct/2024:18:53:57 +0000] "GET /nextcloud/status.php HTTP/1.1" 301 465 "-" "scan.nextcloud.com"
95.217.53.149 - - - [29/Oct/2024:18:53:57 +0000] "GET /oc-shib/status.php HTTP/1.1" 301 461 "-" "scan.nextcloud.com"
95.217.53.149 - - - [29/Oct/2024:18:53:57 +0000] "GET /oc/status.php HTTP/1.1" 301 451 "-" "scan.nextcloud.com"

i would like to know, why the request 301 is blown out. At least /status.php should be accessible. I can open it from several other machines.

Browser inspector.

Check the Network and Console tabs.