NCP Server gets stuck when trying to load images --> Internal Server Error (500)

ℹ️ Support
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Hi Nextcloud-Community!

I am facing issues which already takes me dozens of ours and 3 complete reinstallations of my Pi4 with NextCloudPi… :confused:

In short: Everything works fine until I upload more than 50 JPEG images to a folder and try to access via Browser or the mobile app… Then the server loses connection and doesn’t answer for a few seconds and then I get an Error 500 with message “Internal Server Error”.

After a minute, the web server is available again before it again stuck after trying accessing the files…

Nextcloud version (eg, 20.0.5): 20.0.10
Operating system and version (eg, Ubuntu 20.04): NextCloudPi_11-27-20 // Linux 5.10.17-v8+ aarch64
Apache or nginx version (eg, Apache 2.4.25): 2.4.38
PHP version (eg, 7.4): 7.3.27

The issue you are facing:

After accessing a folder with many (jpeg) images (50-500) via web frontend or mobile app, the server get stuck and loses its connection (also a SSH connection is terminated). Some seconds later, the web server shows “Internal Server Error” in browser. A few minutes later the system is back up and works until the folder is accessed again.

Is this the first time you’ve seen this error? (Y/N): No

Steps to replicate it:

  1. Upload some images into a folder
  2. access this folder via browser or mobile app
  3. some previews are loaded then it stucks

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


<?php
$CONFIG = array (
  'passwordsalt' => 'XXXXXXXXXXXXXXXXXXXXXXXXXXX',
  'secret' => 'XXXXXXXXXXXXXXXXXXXXXX',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    5 => 'nextcloudpi.local',
    7 => 'nextcloudpi',
    8 => 'nextcloudpi.lan',
    11 => '2003:fb:c710:8c00:d059:4e8f:9f36:f0f2',
    1 => '192.168.2.100',
    20 => 'XXX.de',
    21 => 'XXX.de',
    22 => '192.168.2.100',
    12 => 'XXXX.de',
  ),
  'datadirectory' => '/media/myCloudDrive/ncdata',
  'dbtype' => 'mysql',
  'version' => '20.0.10.1',
  'overwrite.cli.url' => 'XXX.de/',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'ncadmin',
  'dbpassword' => 'XXXX',
  'installed' => true,
  'instanceid' => 'ocwn0g3teaag',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,
    'timeout' => 0.0,
    'password' => 'XXXX',
  ),
  'tempdirectory' => '/media/myCloudDrive/ncdata/tmp',
  'mail_smtpmode' => 'smtp',
  'mail_from_address' => 'XXXX',
  'mail_domain' => 'XXXX.de',
  'preview_max_x' => '2048',
  'preview_max_y' => '2048',
  'jpeg_quality' => '60',
  'overwriteprotocol' => 'https',
  'maintenance' => false,
  'logfile' => '/media/myCloudDrive/ncdata/nextcloud.log',
  'loglevel' => '2',
  'log_type' => 'file',
  'htaccess.RewriteBase' => '/',
  'updater.secret' => 'XXXX',
  'theme' => '',

The output of your Apache log in /var/log/error.log:
No entries are created when the issue appears…

What log files should I monitor and what log level should I choose?

I am looking forward for any help and appreciate any support!"