EDIT: Solved, it was SELinux. I fixed it by setting the httpd_unified boolean

So I'm in the process of installing nextcloud with nginx on a Fedora 34 Server installation, but I'm running into some setup problems. I go to the domain I specified in the nginx config file and I'm presented with this:

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https://preview.redd.it/dvbvy3e9kkn71.png?width=737&format=png&auto=webp&s=1978dae580bb5072e33370b3b60d53cd083bc3d9

So I went to check the nginx error log to see if I could get anything more specific, where I found this:

2021/09/14 21:20:22 [error] 1543#1543: *6 FastCGI sent in stderr: "PHP message: {"reqId":"dMMUinukGYDbgWkVCf5Q","level":3,"time":"2021-09-15T01:20:22 00:00","remoteAddr":"192.168.1.219","user":"--","app":"PHP","method":"GET","url":"/","message":"touch(): Unable to create file /var/www/nextcloud/config/config.php because Permission denied at /var/www/nextcloud/lib/private/Config.php#246"

This looks like a file permissions error, but when I go to that directory, all the permissions look fine:

ls -l /var/www/nextcloud

total 148
drwxr-xr-x. 43 nginx nginx  4096 Aug  4 01:44 3rdparty
drwxr-xr-x. 48 nginx nginx  4096 Aug  4 01:42 apps
-rw-r--r--.  1 nginx nginx 19327 Aug  4 01:41 AUTHORS
drwxr-xr-x.  2 nginx nginx  4096 Aug  4 01:44 config
-rw-r--r--.  1 nginx nginx  3924 Aug  4 01:41 console.php
-rw-r--r--.  1 nginx nginx 34520 Aug  4 01:41 COPYING
drwxr-xr-x. 22 nginx nginx  4096 Aug  4 01:44 core
-rw-r--r--.  1 nginx nginx  5121 Aug  4 01:41 cron.php
-rw-r--r--.  1 nginx nginx   156 Aug  4 01:41 index.html
-rw-r--r--.  1 nginx nginx  3454 Aug  4 01:41 index.php
drwxr-xr-x.  6 nginx nginx  4096 Aug  4 01:41 lib
-rw-r--r--.  1 nginx nginx   283 Aug  4 01:41 occ
drwxr-xr-x.  2 nginx nginx  4096 Aug  4 01:41 ocm-provider
drwxr-xr-x.  2 nginx nginx  4096 Aug  4 01:41 ocs
drwxr-xr-x.  2 nginx nginx  4096 Aug  4 01:41 ocs-provider
-rw-r--r--.  1 nginx nginx  3139 Aug  4 01:41 public.php
-rw-r--r--.  1 nginx nginx  5340 Aug  4 01:41 remote.php
drwxr-xr-x.  4 nginx nginx  4096 Aug  4 01:41 resources
-rw-r--r--.  1 nginx nginx    26 Aug  4 01:41 robots.txt
-rw-r--r--.  1 nginx nginx  2452 Aug  4 01:41 status.php
drwxr-xr-x.  3 nginx nginx  4096 Aug  4 01:41 themes
drwxr-xr-x.  2 nginx nginx  4096 Aug  4 01:42 updater
-rw-r--r--.  1 nginx nginx   402 Aug  4 01:44 version.php

ls -l /var/www/nextcloud/config

total 60 
-rw-r--r--. 1 nginx nginx     0 Aug  4 01:41 CAN_INSTALL
-rw-r--r--. 1 nginx nginx 60432 Aug  4 01:41 config.sample.php

The nginx and php-fpm processes are both running as the nginx user, so I'm not totally sure what's going on here. If anyone can point me in the right direction, that would be helpful.