Nextcloud only uploads files <15kB

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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:

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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, 18.0.2): 20.0.2
Operating system and version (eg, Ubuntu 20.04): Linux 5.4.72-v7l+ armv7l
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1): 7.3.19

The issue you are facing:

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

Steps to replicate it:

  1. Because I had problems syncing with the Desktop Client I switched off E2E-Encryption.
  2. Now the Upload of any files does not work on any client, if the file is bigger than 15kB. Downloading the existing files still works.
  3. Switching E2E-Encryption on again did not work.

The output of your Nextcloud log in Admin > Logging:

[no app in context] Error: Sabre\DAV\Exception\BadRequest: Expected filesize of 1700471 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 8192 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 155
    OCA\DAV\Connector\Sabre\File->put(null)
 1. /var/www/nextcloud/apps/dav/lib/Upload/UploadFolder.php line 46
    OCA\DAV\Connector\Sabre\Directory->createFile("0000000000000000-0000000001700471", null)
 2. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 1104
    OCA\DAV\Upload\UploadFolder->createFile("0000000000000000-0000000001700471", null)
 3. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php line 527
    Sabre\DAV\Server->createFile("uploads/ncp/6b5 ... 1", null, null)
 4. /var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php line 89
    Sabre\DAV\CorePlugin->httpPut(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
 5. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 474
    Sabre\DAV\Server->emit("method:PUT", [Sabre\HTTP\Requ ... }])
 6. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 251
    Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
 7. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 319
    Sabre\DAV\Server->start()
 8. /var/www/nextcloud/apps/dav/lib/Server.php line 332
    Sabre\DAV\Server->exec()
 9. /var/www/nextcloud/apps/dav/appinfo/v2/remote.php line 35
    OCA\DAV\Server->exec()
10. /var/www/nextcloud/remote.php line 167
    require_once("/var/www/nextcl ... p")

PUT /remote.php/dav/uploads/ncp/6b54467124445e3650190937a89125db/0000000000000000-0000000001700471
from 195.37.6.6 by ncp at 2020-12-03T09:16:04+00:00

[PHP] Error: Error: Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php:132) at /var/www/nextcloud/apps/dav/lib/Connector/Sabre/File.php#691 at <<closure>>

0. <<closure>>
   OC\Log\ErrorHandler::onError(2, "Cannot modify h ... )", "/var/www/nextcl ... p", 691, {string: "X-Hash ... "})
1. /var/www/nextcloud/apps/dav/lib/Connector/Sabre/File.php line 691
   header("X-Hash-SHA256:  ... 7")
2. /var/www/nextcloud/apps/dav/lib/Connector/Sabre/File.php line 195
   OCA\DAV\Connector\Sabre\File->header("X-Hash-SHA256:  ... 7")
3. <<closure>>
   OCA\DAV\Connector\Sabre\File->OCA\DAV\Connector\Sabre\{closure}("*** sensitive parameters replaced ***")
4. /var/www/nextcloud/lib/private/Files/Stream/HashWrapper.php line 71
   call_user_func(Closure {}, "*** sensitive parameter replaced ***")
5. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 319
   OC\Files\Stream\HashWrapper->stream_close()
6. /var/www/nextcloud/apps/dav/lib/Server.php line 332
   Sabre\DAV\Server->exec()
7. /var/www/nextcloud/apps/dav/appinfo/v2/remote.php line 35
   OCA\DAV\Server->exec()
8. /var/www/nextcloud/remote.php line 167
   require_once("/var/www/nextcl ... p")

PUT /remote.php/dav/uploads/ncp/6b54467124445e3650190937a89125db/0000000000000000-0000000001700471
from 195.37.6.6 by ncp at 2020-12-03T09:16:04+00:00
2

The old topic originates before Nextcloud split from ownCloud, therefore the guideline from early after the split should still be valid: