PDF file could not be downloaded in IE instead there is an empty page

[er47]

Steps to reproduce

1. Open any PDF file in NextCloud using Internet Explorer
2. Click on upper right download icon
3. It shows only an empty page

Expected behaviour

PDF should be downloaded or a "save as" dialog should pop up.

Actual behaviour

PDF is not downloaded instead browser shows an empty page

Server configuration

Operating system: Oracle Linux 7.4 3.8.13-118.20.3

Web server: Apache 2.4.6

Database: MySQL 5.6.39

PHP version: PHP 7.1.14

Nextcloud version: (see Nextcloud admin page) 12.0.6

Where did you install Nextcloud from: NextCloud

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

Enabled:

• activity: 2.5.2
• admin_audit: 1.2.0
• bruteforcesettings: 1.0.3
• comments: 1.2.0
• contacts: 2.1.2
• dav: 1.3.1
• federatedfilesharing: 1.2.0
• federation: 1.2.0
• files: 1.7.2
• files_antivirus: 1.2.0
• files_pdfviewer: 1.1.1
• files_sharing: 1.4.0
• files_texteditor: 2.4.1
• files_trashbin: 1.2.0
• files_versions: 1.5.0
• files_videoplayer: 1.1.0
• logreader: 2.0.0
• lookup_server_connector: 1.0.0
• nextcloud_announcements: 1.1
• notifications: 2.0.0
• oauth2: 1.0.5
• password_policy: 1.2.2
• provisioning_api: 1.2.0
• serverinfo: 1.2.0
• sharebymail: 1.2.0
• survey_client: 1.0.0
• systemtags: 1.2.0
• theming: 1.3.0
• theming_customcss: 1.0.0
• twofactor_backupcodes: 1.1.1
• updatenotification: 1.2.0
• workflowengine: 1.2.0

Nextcloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or

Insert your config.php content here
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

$CONFIG = array (
'instanceid' => 'xxx',
'passwordsalt' => 'xxx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => 'xxx.xxx.xx',
),
'datadirectory' => '/owncloud/data/xxx/data',
'theme' => '',
'overwrite.cli.url' => 'https://xxx.xxx.xx',
'dbtype' => 'mysql',
'version' => '12.0.6.1',
'dbname' => 'xxx',
'dbhost' => 'localhost',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_xxx',
'dbpassword' => 'xxx',
'installed' => true,
'forcessl' => true,
'forceSSLforSubdomains' => true,
'default_language' => 'de_DE',
'force_language' => 'de_DE',
'skeletondirectory' => '',
'updatechecker' => false,
'loglevel' => 0,
'maintenance' => false,
'mail_smtpmode' => 'smtp',
'mail_from_address' => 'xxx',
'mail_domain' => 'xxx.xx',
'mail_smtphost' => '192.168.x.x',
'trashbin_retention_obligation' => 'auto',
'memcache.local' => '\OC\Memcache\Redis',
'filelocking.enabled' => 'true',
'memcache.locking' => '\OC\Memcache\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
'timeout' => 0,
),
'mail_smtpauthtype' => 'LOGIN',
);

Client configuration

Browser: Internet Explorer 11.0.9600.18953

Operating system: Windows 8.1

Logs

Nextcloud log (data/owncloud.log)

Insert your Nextcloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...