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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
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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 
Nextcloud version (eg, 12.0.2): 14.0.0
Operating system and version (eg, Ubuntu 17.04): Debian 9.5.0
Apache or nginx version (eg, Apache 2.4.25): 2.4.25
PHP version (eg, 7.1): 7.0.30
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): N
I came from last version of nextcloud to see if 14.0.0 solved it, but it doesn’t as far as I see. The problem is that I have an external storage NFS and with the official plugin I add it to nextcloud as local, of course the NFS storage is mounted inside the system. Once I start downloading a big file, example: 20GB and then cancel it, seems like the server continues downloading it (don’t know where) as the interface of RX is still receiving a lot of data, once the full file is downloaded in the server (I assume) the RX goes down again. If for example I pause a download file, both RX and TX go down, but if I just cancel the download it happens what it is described before.
Any idea?
Steps to replicate it:
- Mount a nfs dataset in debian
- Activate external storage plugin
- Config the plugin so that files can be browsed
- Start downloading and stop the download
5 The interface Rx won’t go down until the file is downloaded in the server
The output of your Nextcloud log in Admin > Logging:
Nothing to paste, everything seems fine
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ocv3194h6bpq',
'passwordsalt' => 'VAYAFkQkZpQr7IX2fwCRqTTAzoBLCJ',
'secret' => 'ravqkxlSe+II4sFNvGbYRwac83ec0mDZCygFR18SgR8874EJ',
'trusted_domains' =>
array (
0 => '192.168.1.203',
),
'datadirectory' => '/var/www/nextcloud/data',
'dbtype' => 'mysql',
'version' => '14.0.0.19',
'overwrite.cli.url' => 'http://192.168.1.203',
'dbname' => 'nextcloud',
'dbhost' => '127.0.0.1',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud',
'dbpassword' => '*****',
'installed' => true,
'updater.release.channel' => 'stable',
);
The output of your Apache/nginx/system log in /var/log/apache2/error.log:
[Mon Sep 24 23:15:18.907747 2018] [mpm_prefork:notice] [pid 777] AH00169: caught SIGTERM, shutting down
[Mon Sep 24 23:15:19.591906 2018] [mpm_prefork:notice] [pid 1344] AH00163: Apache/2.4.25 (Debian) configured -- resuming normal operations
[Mon Sep 24 23:15:19.591956 2018] [core:notice] [pid 1344] AH00094: Command line: '/usr/sbin/apache2'
[Mon Sep 24 23:34:48.736848 2018] [core:notice] [pid 1344] AH00052: child pid 1563 exit signal Segmentation fault (11)
[Mon Sep 24 23:34:48.737404 2018] [mpm_prefork:notice] [pid 1344] AH00169: caught SIGTERM, shutting down
[Mon Sep 24 23:34:48.858873 2018] [mpm_prefork:notice] [pid 1649] AH00163: Apache/2.4.25 (Debian) configured -- resuming normal operations
[Mon Sep 24 23:34:48.858919 2018] [core:notice] [pid 1649] AH00094: Command line: '/usr/sbin/apache2'
[Mon Sep 24 23:35:38.088968 2018] [core:notice] [pid 1649] AH00052: child pid 1651 exit signal Segmentation fault (11)
[Mon Sep 24 23:35:38.089332 2018] [mpm_prefork:notice] [pid 1649] AH00169: caught SIGTERM, shutting down
[Mon Sep 24 23:35:38.191625 2018] [mpm_prefork:notice] [pid 1687] AH00163: Apache/2.4.25 (Debian) configured -- resuming normal operations
The output of your Apache/nginx/system log in /var/log/apache2/nextcloud_error.log:
[Mon Sep 24 23:19:25.788683 2018] [authz_core:error] [pid 1358] [client 192.168.1.64:49650] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:26.598217 2018] [authz_core:error] [pid 1365] [client 192.168.1.64:49647] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:27.220860 2018] [authz_core:error] [pid 1376] [client 192.168.1.64:49651] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:36.631662 2018] [authz_core:error] [pid 1404] [client 192.168.1.64:49681] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:37.629213 2018] [authz_core:error] [pid 1363] [client 192.168.1.64:49680] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:38.925246 2018] [authz_core:error] [pid 1358] [client 192.168.1.64:49650] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:39.608312 2018] [authz_core:error] [pid 1404] [client 192.168.1.64:49681] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:40.599377 2018] [authz_core:error] [pid 1364] [client 192.168.1.64:49678] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:41.915558 2018] [authz_core:error] [pid 1365] [client 192.168.1.64:49687] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:43.430706 2018] [authz_core:error] [pid 1358] [client 192.168.1.64:49650] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata
[Mon Sep 24 23:19:44.177766 2018] [authz_core:error] [pid 1350] [client 192.168.1.64:49696] AH01630: client denied by server configuration: /var/www/nextcloud/data/.ocdata