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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): 27.1.07
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04
Apache or nginx version (eg, Apache 2.4.25): nginx 1.18.0
PHP version (eg, 7.4): 8.2
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it:
- Install NextCloud
- Create nginx configuration
- Login in - receive error 403
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
2023/09/19 15:44:44 [error] 508475#508475: *3 directory index of "/var/www/nextcloud/apps/dashboard/" is forbidden, client: REDACTED, server: REDACTED, request: "GET /apps/dashboard/ HTTP/2.0
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
PASTE HERE
My nginx configuration
upstream php-handler {
server unix:/run/php/php8.2-fpm.sock;
}
server {
if ($host = REDACTED) {
return 301 https://$host$request_uri;
}
listen 80;
listen [::]:80;
server_name REDACTED;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name REDACTED;
ssl_certificate /etc/letsencrypt/live/REDACTED/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/REDACTED/privkey.pem;
include /etc/letsencrypt/options-ssl-nginx.conf;
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
root /var/www/nextcloud;
client_max_body_size 512M;
fastcgi_buffers 64 4K;
# Security headers
add_header Referrer-Policy "no-referrer" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Download-Options "noopen" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Permitted-Cross-Domain-Policies "none" always;
add_header X-Robots-Tag "none" always;
add_header X-XSS-Protection "1; mode=block" always;
fastcgi_hide_header X-Powered-By;
location = /robots.txt {
allow all;
log_not_found off;
access_log off;
}
location ^~ /.well-known {
location = /.well-known/carddav { return 301 /remote.php/dav/; }
location = /.well-known/caldav { return 301 /remote.php/dav/; }
location /.well-known/acme-challenge { try_files $uri $uri/ =404; }
location /.well-known/pki-validation { try_files $uri $uri/ =404; }
return 301 /index.php$request_uri;
}
location ~ ^/(?:build|tests|config|lib|3rdparty|templates|data)/ {
return 404;
}
location ~ ^/(?:\.|autotest|occ|issue|indie|db_|console) {
return 404;
}
location ~ \.php(?:$|/) {
fastcgi_split_path_info ^(.+?\.php)(/.*)$;
set $path_info $fastcgi_path_info;
try_files $fastcgi_script_name =404;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $path_info;
fastcgi_param HTTPS on;
fastcgi_param modHeadersAvailable true;
fastcgi_param front_controller_active true;
fastcgi_pass php-handler;
fastcgi_intercept_errors on;
fastcgi_request_buffering off;
}
location ~ \.(?:css|js|svg|gif)$ {
try_files $uri /index.php$request_uri;
add_header Cache-Control "public, max-age=15778463";
}
location ~ \.woff2?$ {
try_files $uri /index.php$request_uri;
expires 7d;
access_log off;
}
location / {
try_files $uri $uri/ /index.php$request_uri;
}
}