Syncing with NC Fails - super slow network before network crashes

Hi everyone,

I do really hope that my question is kinda new. I couldn’t find anything matching my problem, there where a few similarities in other topics though.

Since I don’t even know how to name my problem, here goes the description (if there should be another thread regarding my problem I’d be thankful for a link to that one):

I have NC (NCPi) running on a Pi 3 B+. Everything works fine so far, I’m able to connect from inside my network or over the internet. File transfer is working. I can access via iOs.

Here comes the glitch:

Whenever I try to sync NC with my PC or my Laptop, it starts very slow, it syncs like six files and then my Network crashes an my router and switch are restarting in most cases. Also, I see that something is disturbing the network because my TV broadcast stops working (I have TV over IP running on Windows10).

If I can add any Info please let me know.

Many thanks in Advance!


Support intro

Sorry to hear you’re facing problems :slightly_frowning_face: is for home/non-enterprise users. If you’re running a business, paid support can be accessed via where we can ensure your business keeps running smoothly.

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:


Or for longer, use three backticks above and below the code snippet:


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 :heart:

Nextcloud version (eg, 12.0.2): 18.0.1
Operating system and version (eg, Ubuntu 17.04): Debian, 10.1
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38
PHP version (eg, 7.1): 7.3

The issue you are facing:

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

Steps to replicate it:

  1. start NC-Sync-app on windows
  2. wait for file up-/download
  3. see network blowing up

The output of your Nextcloud log in Admin > Logging:

[webdav] Fatal: Sabre\DAV\Exception\BadRequest: Expected filesize of 1773101 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 1744896 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side. at <<closure>>

0. /var/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php line 156
1. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 1096
   OCA\DAV\Connector\Sabre\Directory->createFile("Verringerung_re ... x", null)
2. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php line 525
   Sabre\DAV\Server->createFile("files/***/ ... x", null, null)
3. <<closure>>
   Sabre\DAV\CorePlugin->httpPut(Sabre\HTTP\Reque ... "}, Sabre\HTTP\Response {})
4. /var/www/nextcloud/3rdparty/sabre/event/lib/EventEmitterTrait.php line 105
   call_user_func_array([Sabre\DAV\CorePlugin {},"httpPut"], [Sabre\HTTP\Requ ... }])
5. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 479
   Sabre\Event\EventEmitter->emit("method:PUT", [Sabre\HTTP\Requ ... }])
6. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 254
   Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Reque ... "}, Sabre\HTTP\Response {})
7. /var/www/nextcloud/apps/dav/lib/Server.php line 319
8. /var/www/nextcloud/apps/dav/appinfo/v2/remote.php line 35
9. /var/www/nextcloud/remote.php line 165
   require_once("/var/www/nextcl ... p")

PUT /remote.php/dav/files/........docx
from by *** at 2020-03-08T14:31:12+00:00

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

$CONFIG = array (
  'passwordsalt' => '***',
  'secret' => '***',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    5 => 'nextcloudpi.local',
    7 => 'nextcloudpi',
    8 => 'nextcloudpi.lan',
    1 => '192.168.0.***',
    12 => '***.com',
  'datadirectory' => '/media/myCloudDrive/ncdata',
  'dbtype' => 'mysql',
  'version' => '',
  'overwrite.cli.url' => 'https://***.com/',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'ncadmin',
  'dbpassword' => '***',
  'installed' => true,
  'instanceid' => 'oc5njr8cf6sp',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,
    'timeout' => 0.0,
    'password' => '***',
  'tempdirectory' => '/media/myCloudDrive/ncdata/tmp',
  'mail_smtpmode' => 'sendmail',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_from_address' => 'admin',
  'mail_domain' => '',
  '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',


Most of the cases the RPi 3 is not very fast and with many clients it takes longer. I never heard that someone managed to kill his router and switch. I’d test a bit the network independently and see if there is something wrong in your network configuration or if it is your router?

Well, it was a bit of everything. :see_no_evil:
My network cable was damaged so it seems that this caused my router to restart.
The “1st sync” however is not working properly. I helped myself with syncing externally and checking for new files via ncp.
The ordinary sync without this massive load of data is working fine for now.
Thanks for your response! :slight_smile: