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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
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): 22.0.0.11
Operating system and version (eg, Ubuntu 20.04): Asuswrt-Merlin 386.2_6
Apache or nginx version (eg, Apache 2.4.25): nginx/1.19.6 (x86_64-pc-linux-gnu)
PHP version (eg, 7.4): 7.4.20
The issue you are facing: It’s my first time setting up nextcloud, and I installed it on Asuswrt-Merlin firmware on my router. I get an internal server error when creating a new admin account. For your information, I followed this guide to install nginx web server and the NextCloud: NextCloud through Nginx Entware – HQT, except that I installed the newest version of NextCloud (22.0.0)
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it:
- After setting up the nextcloud for the first time
- Go to the nextcloud home page to create an admin account
- Internal Error appears and I cant continue to set up the Nextcloud
The output of your Nextcloud log in Admin > Logging:
{"reqId":"VCRBLn0Y3e3WWXFBBn8V","level":2,"time":"2021-07-18T10:14:22+00:00","remoteAddr":"192.168.1.152","user":"--","app":"no app in context","method":"GET","url":"/nextcloud/index.php","message":"Host 192.168.1.1 was not connected to because it violates local access rules","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36","version":"22.0.0.11"}
{"reqId":"VCRBLn0Y3e3WWXFBBn8V","level":2,"time":"2021-07-18T10:14:22+00:00","remoteAddr":"192.168.1.152","user":"--","app":"no app in context","method":"GET","url":"/nextcloud/index.php","message":"Host 192.168.1.1 was not connected to because it violates local access rules","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36","version":"22.0.0.11"}
{"reqId":"3zWViQ5EAKw0ssP2fXGA","level":2,"time":"2021-07-18T10:14:42+00:00","remoteAddr":"192.168.1.152","user":"--","app":"no app in context","method":"POST","url":"/nextcloud/index.php","message":"Host 192.168.1.1 was not connected to because it violates local access rules","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36","version":"22.0.0.11"}
{"reqId":"3zWViQ5EAKw0ssP2fXGA","level":2,"time":"2021-07-18T10:14:42+00:00","remoteAddr":"192.168.1.152","user":"--","app":"no app in context","method":"POST","url":"/nextcloud/index.php","message":"Host 192.168.1.1 was not connected to because it violates local access rules","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36","version":"22.0.0.11"}
{"reqId":"3zWViQ5EAKw0ssP2fXGA","level":3,"time":"2021-07-18T10:15:03+00:00","remoteAddr":"192.168.1.152","user":"--","app":"index","method":"POST","url":"/nextcloud/index.php","message":"Call to undefined function OC\\Http\\Client\\dns_get_record()","userAgent":"Mozilla/5.0 (Windows NT 10.0;
Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36","version":"22.0.0.11","exception":{"Exception":"Error","Message":"Call to undefined function OC\\Http\\Client\\dns_get_record()","Code":0,"Trace":[{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/Http/Client/DnsPinMiddleware.php","line":113,"function":"dnsResolve","class":"OC\\Http\\Client\\DnsPinMiddleware","type":"->","args":["apps.nextcloud.com",0]},{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php","line":35,"function":"OC\\Http\\Client\\{closure}","class":"OC\\Http\\Client\\DnsPinMiddleware","type":"->","args":
["*** sensitive parameters replaced ***"]},{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":31,"function":"__invoke","class":"GuzzleHttp\\PrepareBodyMiddleware","type":"->","args":["*** sensitive parameter replaced ***","*** sensitive parameter replaced ***"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php","line":71,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":63,"function":"__invoke","class":"GuzzleHttp\\RedirectMiddleware","type":"->","args":["*** sensitive parameter replaced ***","*** sensitive parameter replaced ***"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php","line":75,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":331,"function":"__invoke","class":"GuzzleHttp\\HandlerStack","type":"->","args":["*** sensitive parameter replaced ***","*** sensitive parameter replaced ***"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":168,"function":"transfer","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameter replaced ***","*** sensitive parameter replaced ***"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":187,"function":"requestAsync","class":"GuzzleHttp\\Client","type":"->","args":["get",{"__class__":"GuzzleHttp\\Psr7\\Uri"},{"verify":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/resources/config/ca-bundle.crt","timeout":60,"allow_redirects":{"on_redirect":{"__class__":"Closure"}},"nextcloud":
{"allow_local_address":false},"synchronous":true,"0":"And 6 more entries, set log level to debug to see all entries"}]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/Http/Client/Client.php","line":223,"function":"request","class":"GuzzleHttp\\Client","type":"->","args":["get","https://apps.nextcloud.com/api/v1/apps.json",
{"verify":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/resources/config/ca-bundle.crt","timeout":60,"allow_redirects":{"on_redirect":{"__class__":"Closure"}},"nextcloud":{"allow_local_address":false},"headers":{"User-Agent":"Nextcloud Server Crawler","Accept-Encoding":"gzip"},"0":"And 1 more entries, set log level to debug to see all entries"}]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/App/AppStore/Fetcher/Fetcher.php","line":108,"function":"get","class":"OC\\Http\\Client\\Client","type":"->","args":["https://apps.nextcloud.com/api/v1/apps.json",{"timeout":60}]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/App/AppStore/Fetcher/AppFetcher.php","line":79,"function":"fetch","class":"OC\\App\\AppStore\\Fetcher\\Fetcher","type":"->","args":["",""]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/App/AppStore/Fetcher/Fetcher.php","line":180,"function":"fetch","class":"OC\\App\\AppStore\\Fetcher\\AppFetcher","type":"->","args":["","",false]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/Installer.php","line":231,"function":"get","class":"OC\\App\\AppStore\\Fetcher\\Fetcher","type":"->","args":[false]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/Installer.php","line":532,"function":"downloadApp","class":"OC\\Installer","type":"->","args":["bruteforcesettings"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/Setup.php","line":407,"function":"installAppBundle","class":"OC\\Installer","type":"->","args":[{"__class__":"OC\\App\\AppStore\\Bundles\\CoreBundle"}]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/Controller/SetupController.php","line":74,"function":"install","class":"OC\\Setup","type":"->","args":["*** sensitive parameters replaced ***"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/base.php","line":939,"function":"run","class":"OC\\Core\\Controller\\SetupController","type":"->","args":["*** sensitive parameters replaced ***"]},
{"file":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/index.php","line":36,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/lib/private/Http/Client/DnsPinMiddleware.php","Line":52,"CustomMessage":"--"}}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '[redacted]',
'passwordsalt' => '[redacted]',
'secret' => 'deCLTC8C9S7H18bcmjg+Ay5/Oh0VTiHwaCiY7ON2IBjy0b7D',
'trusted_domains' =>
array (
0 => '192.168.1.1:82',
),
'datadirectory' => '/tmp/mnt/sda2/entware/share/nginx/html/nextcloud/data',
'dbtype' => 'sqlite3',
'version' => '22.0.0.11',
'overwrite.cli.url' => 'http://192.168.1.1:82/nextcloud',
);
The output of nginx error log in /tmp/mnt/sda2/entware/var/log/nginx:
2021/07/18 16:19:07 [notice] 18860#0: signal process started
2021/07/18 16:22:26 [error] 1499#0: *1 open() "/opt/share/nginx/html/favicon.ico" failed (2: No such file or directory), client: 192.168.1.152, server: localhost, request: "GET /favicon.ico HTTP/1.1", host: "192.168.1.1:82", referrer: "http://192.168.1.1:82/"
2021/07/18 16:29:28 [error] 1499#0: *27 open() "/opt/share/nginx/html/favicon.ico" failed (2: No such file or directory), client: 192.168.1.152, server: localhost, request: "GET /favicon.ico HTTP/1.1", host: "[IP redacted]", referrer: "http://[IP redacted]/"
2021/07/18 08:39:05 [notice] 22263#0: signal process started
2021/07/18 09:30:37 [notice] 29159#0: signal process started
The output of nextcloud error log in /tmp/mnt/sda2/entware/var/log/nginx
2021/07/18 08:39:36 [error] 22267#0: *9 open() "/opt/share/nginx/html/nextcloud" failed (2: No such file or directory), client: 192.168.1.152, server: localhost, request: "GET /nextcloud HTTP/1.1", host: "192.168.1.1:82"
2021/07/18 09:31:03 [error] 29163#0: *9 FastCGI sent in stderr: "PHP Fatal error: Cannot redeclare print_exception() (previously declared in /tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/templates/exception.php:7) in /tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/templates/exception.php on line 7" while reading response header from upstream, client: 192.168.1.152, server: localhost, request: "GET /nextcloud/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.1.1:82"
2021/07/18 09:31:03 [error] 29163#0: *9 FastCGI sent in stderr: "PHP Fatal error: Cannot redeclare print_exception() (previously declared in /tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/templates/exception.php:7) in /tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/templates/exception.php on line 7" while reading response header from upstream, client: 192.168.1.152, server: localhost, request: "GET /nextcloud/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.1.1:82"
2021/07/18 09:31:13 [error] 29163#0: *9 FastCGI sent in stderr: "PHP Fatal error: Cannot redeclare print_exception() (previously declared in /tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/templates/exception.php:7) in /tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/templates/exception.php on line 7" while reading response header from upstream, client: 192.168.1.152, server: localhost, request: "GET /nextcloud/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.1.1:82"
2021/07/18 09:31:13 [error] 29163#0: *9 FastCGI sent in stderr: "PHP Fatal error: Cannot redeclare print_exception() (previously declared in /tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/templates/exception.php:7) in /tmp/mnt/sda2/entware/share/nginx/html/nextcloud/core/templates/exception.php on line 7" while reading response header from upstream, client: 192.168.1.152, server: localhost, request: "GET /nextcloud/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.1.1:82"
2021/07/18 11:36:02 [error] 29163#0: *97 "/opt/share/nginx/html/HNAP1/index.php" is not found (2: No such file or directory), client: 110.18.47.97, server: localhost, request: "GET /HNAP1/ HTTP/1.1", host: "[IP REDACTED]", referrer: "http://[IP REDACTED]/"
2021/07/18 11:36:02 [error] 29163#0: *97 "/opt/share/nginx/html/HNAP1/index.php" is not found (2: No such file or directory), client: [IP REDACTED], server: localhost, request: "GET /HNAP1/ HTTP/1.1", host: "[IP REDACTED]", referrer: "http://[IP REDACTED]/"
2021/07/18 13:25:30 [error] 29163#0: *119 open() "/opt/share/nginx/html/favicon.ico" failed (2: No such file or directory), client: 192.168.1.152, server: localhost, request: "GET /favicon.ico HTTP/1.1", host: "192.168.1.1:82", referrer: "http://192.168.1.1:82/"
2021/07/18 13:25:30 [error] 29163#0: *119 open() "/opt/share/nginx/html/favicon.ico" failed (2: No such file or directory), client: 192.168.1.152, server: localhost, request: "GET /favicon.ico HTTP/1.1", host: "192.168.1.1:82", referrer: "http://192.168.1.1:82/"