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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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:
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!
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): 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":"193.61.145.177","user":"--","app":"core","method":"POST","url":"\/nextcloud\/index.php\/login","message":"Login failed: 'uu_admin' (Remote IP: '193.61.145.177')","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":"15.0.5.3"} ``` 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' => '15.0.5.3', '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 ```