Wrong password when trying to connect on any user

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Sudden “Wrong Password” for all users,  NC was runing for 8 month since installation without any issues. Now all users have the same “Wrong password” problem and same message which is not disappear with time “We have detected multiple invalid login attempts from your IP. Therefore your next login is throttled up to 30 seconds.” 
I didn't do anything it was solid and stable but today no one can get access. Please help!

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Nextcloud version (eg, 12.0.2): cannot see it since cannot login into it. Here is version.php from ftp.

<?php $OC_Version = array(15,0,5,3); $OC_VersionString = '15.0.5'; $OC_Edition = ''; $OC_Channel = 'stable'; $OC_VersionCanBeUpgradedFrom = array ( 'nextcloud' => array ( '14.0' => true, '15.0' => true, ), 'owncloud' => array ( ), ); $OC_Build = '2019-02-27T20:47:13+00:00 5679410fef10e88e064dc08675e7fb1e52b7a7b3'; $vendor = 'nextcloud'; Operating system and version _(eg, Ubuntu 17.04)_: have no clue since it is on hosting Apache or nginx version _(eg, Apache 2.4.25)_: how to get it? PHP version _(eg, 7.1)_: where to check? The issue you are facing: Is this the first time you've seen this error? _(Y/N)_: Y Steps to replicate it: 1. 2. 3. The output of your Nextcloud log in **Admin > Logging**: ``` {"reqId":"XgDoi6p43TnMYvlLeak6fAAAAAA","level":2,"time":"2019-12-23T16:17:41+00:00","remoteAddr":"","user":"--","app":"core","method":"POST","url":"\/nextcloud\/index.php\/login","message":"Login failed: 'uu_admin' (Remote IP: '')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/79.0.3945.88 Safari\/537.36","version":""} ``` The output of your config.php file in `/path/to/nextcloud` (make sure you remove any identifiable information!): ``` <?php $CONFIG = array ( 'instanceid' => 'ocs26yn94kc5', 'passwordsalt' => '26yf07Uhs****ni5fsGrQVmeWld', 'secret' => 'hwnN2uGXp****EKJekuLVRLdM//kYYkBurvhQzO', 'trusted_domains' => array ( 0 => 'h*****l.net', ), 'datadirectory' => '/home/cluster-sites/8/h/h*****l.net/public_html/nextcloud/data', 'dbtype' => 'sqlite3', 'version' => '', 'overwrite.cli.url' => 'http://hy****l.net/nextcloud', 'installed' => true, 'maintenance' => false, 'filelocking.enabled' => false, 'mail_from_address' => 'h****el', 'mail_smtpmode' => 'smtp', 'mail_sendmailmode' => 'smtp', 'mail_domain' => 'gmail.com', 'mail_smtpauthtype' => 'LOGIN', 'mail_smtpauth' => 1, 'mail_smtphost' => 'smtp.gmail.com', 'mail_smtpport' => '465', 'mail_smtpname' => 'hy*****el@gmail.com', 'mail_smtppassword' => 'ogaa******cjrryxd', 'mail_smtpsecure' => 'ssl', ); ``` The output of your Apache/nginx/system log in `/var/log/____`: ``` have no access to it or don't know how to get there, since on hosting ```