Support intro
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:
longer
example
here
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, 20.0.5): 20.0.7
Operating system and version (eg, Ubuntu 20.04): CentOS 8 stream full updated
Apache or nginx version (eg, Apache 2.4.25): apache 2.4.37
PHP version (eg, 7.4): 7.4.15
The issue you are facing:
installing nextcloud following instruction on nextcloud web site
https://docs.nextcloud.com/server/20/admin_manual/installation/example_centos.html
i can successfull get web page for setup data folder and database, but after cannot login anymore.
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- install centos 8 stream with development group
- install nextcloud as per guide on Example installation on CentOS 8 — Nextcloud latest Administration Manual latest documentation
The output of your Nextcloud log in Admin > Logging:
{"reqId":"YCOm44b7qjnL610VLEu@8gAAAIE","level":2,"time":"2021-02-10T09:26:59+00:00","remoteAddr":"10.1.20.38","user":"--","app":"no app in context","method":"POST","url":"/index.php/index.php","message":"Could not detect any host in http:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"YCOm44b7qjnL610VLEu@8gAAAIE","level":2,"time":"2021-02-10T09:26:59+00:00","remoteAddr":"10.1.20.38","user":"--","app":"no app in context","method":"POST","url":"/index.php/index.php","message":"Could not detect any host in https:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"YCOndl2GDpxbNmkKn-sbOwAAAAg","level":3,"time":"2021-02-10T09:29:26+00:00","remoteAddr":"10.1.20.38","user":"--","app":"index","method":"GET","url":"/index.php/apps/accessibility/css/user-a82fd95db10ff25dfad39f07372ebe37","message":{"Exception":"OCP\\Files\\NotPermittedException","Message":"Could not create folder","Code":0,"Trace":[{"file":"/var/www/html/nextcloud/lib/private/Files/AppData/AppData.php","line":157,"function":"newFolder","class":"OC\\Files\\Node\\Folder","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Template/IconsCacher.php","line":90,"function":"newFolder","class":"OC\\Files\\AppData\\AppData","type":"->"},{"function":"__construct","class":"OC\\Template\\IconsCacher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"newInstanceArgs","class":"ReflectionClass","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/ServerContainer.php","line":156,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":430,"function":"query","class":"OC\\ServerContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":87,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"array_map"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":455,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":427,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/App.php","line":139,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Route/Router.php","line":309,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/nextcloud/lib/base.php","line":1008,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/nextcloud/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/nextcloud/lib/private/Files/Node/Folder.php","Line":167,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":"20.0.7.1"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxxxxxxx',
'passwordsalt' => 'xxxxxxxxxx',
'secret' => 'Xxxxxxxxxxx',
'trusted_domains' =>
array (
0 => 'nextcloud.yyyyyyyy.net',
),
'datadirectory' => '/var/www/html/nextcloud/data',
'dbtype' => 'sqlite3',
'version' => '20.0.7.1',
'overwrite.cli.url' => 'http://nextcloud.yyyyyyyy.net',
'installed' => true,
'maintenance' => false,
);
The output of your Apache/nginx/system log in /var/log/:
10.1.20.38 - - [10/Feb/2021:10:29:26 +0100] "GET /core/img/background.png?v=0 HTTP/1.1" 200 9621 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:26 +0100] "GET /index.php/svg/core/logo/logo?color=fff&v=1 HTTP/1.1" 200 321 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/img/loading-dark.gif HTTP/1.1" 200 4683 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/img/actions/toggle.svg HTTP/1.1" 200 308 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/img/actions/confirm-white.svg?v=2 HTTP/1.1" 200 405 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /cron.php HTTP/1.1" 200 20 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /index.php/apps/theming/favicon?v=0 HTTP/1.1" 200 90022 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /index.php/apps/theming/icon?v=0 HTTP/1.1" 200 25145 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /index.php/login?redirect_url=/index.php/core/apps/recommended HTTP/1.1" 200 4837 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /apps/files_rightclick/css/app.css?v=46c85d58-0 HTTP/1.1" 200 412 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/js/dist/files_fileinfo.js?v=57491e95-0 HTTP/1.1" 200 31003 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/js/backgroundjobs.js?v=57491e95-0 HTTP/1.1" 200 943 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /apps/files_sharing/js/dist/main.js?v=57491e95-0 HTTP/1.1" 200 1178 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/js/dist/files_client.js?v=57491e95-0 HTTP/1.1" 200 126285 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /apps/files_pdfviewer/js/files_pdfviewer-public.js?v=57491e95-0 HTTP/1.1" 200 20798 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /index.php/js/core/merged-template-prepend.js?v=57491e95-0 HTTP/1.1" 200 2982 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /index.php/apps/theming/styles?v=0 HTTP/1.1" 200 1275 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /apps/files_videoplayer/js/main.js?v=57491e95-0 HTTP/1.1" 200 6925 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /apps/files_rightclick/js/script.js?v=57491e95-0 HTTP/1.1" 200 14871 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /apps/files_rightclick/js/files.js?v=57491e95-0 HTTP/1.1" 200 4760 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/css/guest.css?v=57491e95-0 HTTP/1.1" 200 20937 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /apps/theming/js/theming.js?v=57491e95-0 HTTP/1.1" 200 60 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/js/dist/main.js?v=57491e95-0 HTTP/1.1" 200 1443329 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/js/dist/login.js?v=57491e95-0 HTTP/1.1" 200 845528 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /index.php/apps/accessibility/css/user-a82fd95db10ff25dfad39f07372ebe37 HTTP/1.1" 200 2677 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /core/img/background.png?v=0 HTTP/1.1" 200 9621 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:27 +0100] "GET /index.php/svg/core/logo/logo?color=fff&v=1 HTTP/1.1" 200 321 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:28 +0100] "GET /core/img/loading-dark.gif HTTP/1.1" 200 4683 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:28 +0100] "GET /core/img/actions/toggle.svg HTTP/1.1" 200 308 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:28 +0100] "GET /core/img/actions/confirm-white.svg?v=2 HTTP/1.1" 200 405 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:28 +0100] "GET /index.php/apps/theming/icon?v=0 HTTP/1.1" 200 25145 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:28 +0100] "GET /index.php/apps/theming/favicon?v=0 HTTP/1.1" 200 90022 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:28 +0100] "GET /cron.php HTTP/1.1" 200 20 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:33 +0100] "POST /index.php/login HTTP/1.1" 303 - "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:33 +0100] "GET /index.php/core/apps/recommended HTTP/1.1" 303 - "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:33 +0100] "GET /index.php/login?redirect_url=/index.php/core/apps/recommended HTTP/1.1" 200 4839 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:29:34 +0100] "GET /cron.php HTTP/1.1" 200 20 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:24 +0100] "POST /index.php/login HTTP/1.1" 303 - "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:24 +0100] "GET /index.php/core/apps/recommended HTTP/1.1" 303 - "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:24 +0100] "GET /index.php/login?redirect_url=/index.php/core/apps/recommended HTTP/1.1" 200 4835 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:25 +0100] "GET /index.php/apps/theming/icon?v=0 HTTP/1.1" 200 25145 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:25 +0100] "GET /cron.php HTTP/1.1" 200 20 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:27 +0100] "POST /index.php/login HTTP/1.1" 303 - "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:27 +0100] "GET /index.php/core/apps/recommended HTTP/1.1" 303 - "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:27 +0100] "GET /index.php/login?redirect_url=/index.php/core/apps/recommended HTTP/1.1" 200 4834 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:32:27 +0100] "GET /cron.php HTTP/1.1" 200 20 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"
10.1.20.38 - - [10/Feb/2021:10:44:28 +0100] "GET /index.php/csrftoken HTTP/1.1" 200 121 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0"