Support intro
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): 18.02
Operating system and version (eg, Ubuntu 17.04): ubuntu 18.X
Apache or nginx version (eg, Apache 2.4.25): nginx 1.17.9
PHP version (eg, 7.1): 7.3.14
The issue you are facing:
I’m getting a internal server error on all logins via the web.
Is this the first time you’ve seen this error? (Y/N):
Y
Steps to replicate it:
Don’t know, happened overnight… maybe some ubuntu patch?
1.
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3.
The output of your Nextcloud log in Admin > Logging:
Level
App Message Time
Fatal webdav Sabre\DAV\Exception\BadRequest: Expected filesize of 10000000 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 1032192 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side. 2020-03-19T13:25:02+0100
Error no app in context Sabre\DAV\Exception\BadRequest: Expected filesize of 10000000 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 1032192 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side. 2020-03-19T13:25:02+0100
Error PHP Unknown: POST Content-Length of 134 bytes exceeds the limit of 20 bytes at Unknown#0 2020-03-19T13:22:25+0100
Error index Exception: Argument 1 passed to OC\Core\Controller\ClientFlowLoginV2Controller::poll() must be of the type string, null given, called in /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php on line 170 2020-03-19T13:22:25+0100
Error PHP Unknown: POST Content-Length of 134 bytes exceeds the limit of 20 bytes at Unknown#0 2020-03-19T13:22:20+0100
Error index Exception: Argument 1 passed to OC\Core\Controller\ClientFlowLoginV2Controller::poll() must be of the type string, null given, called in /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php on line 170 2020-03-19T13:22:20+0100
Error PHP Unknown: POST Content-Length of 134 bytes exceeds the limit of 20 bytes at Unknown#0 2020-03-19T13:22:15+0100
Error index Exception: Argument 1 passed to OC\Core\Controller\ClientFlowLoginV2Controller::poll() must be of the type string, null given, called in /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php on line 170 2020-03-19T13:22:15+0100
Error PHP Unknown: POST Content-Length of 134 bytes exceeds the limit of 20 bytes at Unknown#0 2020-03-19T13:22:10+0100
Error index Exception: Argument 1 passed to OC\Core\Controller\ClientFlowLoginV2Controller::poll() must be of the type string, null given, called in /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php on line 170 2020-03-19T13:22:10+0100
Error PHP Unknown: POST Content-Length of 134 bytes exceeds the limit of 20 bytes at Unknown#0
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'passwordsalt' => '*',
'secret' => '*',
'trusted_domains' =>
array (
0 => '*',
),
'datadirectory' => '/var/nc_data',
'dbtype' => 'mysql',
'version' => '18.0.2.2',
'overwrite.cli.url' => '*',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'nextcloud',
'installed' => true,
'instanceid' => 'ocfgco6oa42x',
'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',
'htaccess.RewriteBase' => '/',
'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',
'overwriteprotocol' => 'https',
'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',
'data-fingerprint' => '*',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'nextcloud',
'mail_domain' => 'ricohnorge.no',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'm*',
'mail_smtpport' => '25',
'mail_smtpname' => 'n*',
'mail_smtppassword' => '*',
'twofactor_enforced' => 'false',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
'updater.secret' => '*',
);
The output of your Apache/nginx/system log in /var/log/____:
2020/03/17 07:37:40 [warn] 19818#19818: *1272244 an upstream response is buffered to a temporary file /var/cache/nginx/fastcgi_temp/2/44/0000003442 while reading upstream, client: 84.215.47.23, server: gateway.ricohnorge.no, request: "GET /remote.php/dav/files/opokje/9110_Andromeda/Andromeda%20Firmware/Gammel%20Firmware/Andromeda%20_P1%20software%204.08/M2056027E/M2056027E.fwu HTTP/1.1", upstream: "fastcgi://unix:/run/php/ph$php/php7.3-fpm.sock:", host: "*"