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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): 15.0.2
Nextcoud Android Client: 3.4.2
Nextcloud LDAP Plugin: 1.5.0
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04.1 LTS
Apache or nginx version (eg, Apache 2.4.25): 2.4.29-1ubuntu4.5
PHP version (eg, 7.1): libapache2-mod-php7.2:
Installiert: 7.2.10-0ubuntu0.18.04.1
The issue you are facing:
I Use Nextcloud Android Client 3.4.2 . Nextcloud Server is installed at our company -> Configured for Authentication via LDAP.
Every few Hours my Active Directory Account is locked (more than 10 Logins with wrong Credentials)
In Security Auditing i can identify wrong Logins come from Nextcloud Server
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Install Active Directory with Account Locking Policy (for example 3 false Attempts)
- Install and Configure Nextcloud 15.0.2 with LDAP Authentication to this Active Directory
- Use Nextcloud Android Client 3.4.2
(Looks Like multiple failed login Attempts. I did not change my password anywhere)
The output of your Nextcloud log in Admin > Logging:
{"reqId":"fn03O2c9IxLa8D0P6Ydu","level":1,"time":"2019-01-22T21:26:03+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"enxFldIAWPB7LQkSHC3g","level":1,"time":"2019-01-22T21:26:03+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"pS1vdh3wJavhL88IuBqD","level":1,"time":"2019-01-22T21:26:04+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"juZq5pTp8LgKCcBJcCOZ","level":1,"time":"2019-01-22T21:26:04+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"eZ9L2KeXn2jYBWcqSpwh","level":1,"time":"2019-01-22T21:37:30+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"0hTIX6muShVGK4V4X2lX","level":1,"time":"2019-01-22T21:37:30+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"lMHexW55ZELqb368cB1c","level":1,"time":"2019-01-22T21:37:36+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"WEDG1GyPVJpi8jnz23cN","level":1,"time":"2019-01-22T22:03:27+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"1TDcm7kv7Pb2g5bi1gBi","level":1,"time":"2019-01-22T22:03:27+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"WEDG1GyPVJpi8jnz23cN","level":1,"time":"2019-01-22T22:03:27+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"F5B89232-315B-455F-9986-42EDE1C14353\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"WEDG1GyPVJpi8jnz23cN","level":1,"time":"2019-01-22T22:03:27+00:00","remoteAddr":"87.155.169.156","user":"F5B89232-315B-455F-9986-42EDE1C14353","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login successful: \"F5B89232-315B-455F-9986-42EDE1C14353\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"1TDcm7kv7Pb2g5bi1gBi","level":1,"time":"2019-01-22T22:03:27+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"F5B89232-315B-455F-9986-42EDE1C14353\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"1TDcm7kv7Pb2g5bi1gBi","level":1,"time":"2019-01-22T22:03:27+00:00","remoteAddr":"87.155.169.156","user":"F5B89232-315B-455F-9986-42EDE1C14353","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login successful: \"F5B89232-315B-455F-9986-42EDE1C14353\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"sOFfBsmi3h23lyFqFC93","level":1,"time":"2019-01-22T22:03:41+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"rudolf.achter@megatech-communication.de\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"sOFfBsmi3h23lyFqFC93","level":1,"time":"2019-01-22T22:03:41+00:00","remoteAddr":"87.155.169.156","user":"--","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login attempt: \"F5B89232-315B-455F-9986-42EDE1C14353\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
{"reqId":"sOFfBsmi3h23lyFqFC93","level":1,"time":"2019-01-22T22:03:41+00:00","remoteAddr":"87.155.169.156","user":"F5B89232-315B-455F-9986-42EDE1C14353","app":"admin_audit","method":"GET","url":"\/index.php\/204","message":"Login successful: \"F5B89232-315B-455F-9986-42EDE1C14353\"","userAgent":"Mozilla\/5.0 (Android) ownCloud-android\/3.4.1","version":"15.0.2.0"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'passwordsalt' => 'XX',
'secret' => 'PXXX',
'trusted_domains' =>
array (
0 => 'localhost',
1 => 'nextcl.domain.local',
2 => 'nextcloud.domain.de',
),
'datadirectory' => '/var/www/nextcloud/data',
'overwrite.cli.url' => 'http://localhost',
'dbtype' => 'mysql',
'version' => '15.0.2.0',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_nexadmin',
'dbpassword' => 'XXX',
'installed' => true,
'instanceid' => 'ocmro5m1qrnp',
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => '\\OCA\\User_LDAP\\LDAPProviderFactory',
'mail_smtpmode' => 'smtp',
'mail_smtpauthtype' => 'PLAIN',
'mail_from_address' => 'nextcloud',
'mail_domain' => 'domain.de',
'maintenance' => false,
'theme' => '',
'loglevel' => 0,
'mail_smtphost' => 'exchange.domain.local',
'mail_smtpport' => '25',
'memcache.local' => '\\OC\\Memcache\\Memcached',
'twofactor_enforced' => 'false',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
);
The output of your Apache/nginx/system log in /var/log//var/log/apache2/other_vhosts_access.log.3.gz:
deslnvmnextcl01.megatech.local:443 192.168.96.60 - rudolf.achter@megatech-communication.de [22/Jan/2019:16:48:42 +0100] "GET /index.php/204 HTTP/1.1" 204 1373 "-" "Mozilla/5.0 (Android) ownCloud-android/3.4.1"
deslnvmnextcl01.megatech.local:443 87.155.169.156 - rudolf.achter@megatech-communication.de [22/Jan/2019:22:26:03 +0100] "GET /index.php/204 HTTP/1.1" 204 7792 "-" "Mozilla/5.0 (Android) ownCloud-android/3.4.1"
deslnvmnextcl01.megatech.local:443 87.155.169.156 - rudolf.achter@megatech-communication.de [22/Jan/2019:22:26:03 +0100] "GET /index.php/204 HTTP/1.1" 204 7794 "-" "Mozilla/5.0 (Android) ownCloud-android/3.4.1"
deslnvmnextcl01.megatech.local:443 87.155.169.156 - rudolf.achter@megatech-communication.de [22/Jan/2019:22:26:04 +0100] "GET /index.php/204 HTTP/1.1" 204 1456 "-" "Mozilla/5.0 (Android) ownCloud-android/3.4.1"
desln