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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, 12.0.2): 17.0.2 (using FreeNAS addon)
Operating system and version (eg, Ubuntu 17.04): FreeNAS Jail running FreeNAS 11.2
Apache or nginx version (eg, Apache 2.4.25): nginx 1.14.0
PHP version (eg, 7.1): 7.1.33
The issue you are facing: 404 Not Found error when clicking the “Open updater” button
Is this the first time you’ve seen this error? (Y/N):
Steps to replicate it:
- Have nextcloud in its own Freenas jail, behind an Nginx virtual proxy. Nginx is installed in Ubuntu (IP: 192.168.1.119)
- Use the default Nginx config file, but comment out anything having to do with php as you can’t figure out how to reference it properly.
- Click “Update” in Nextcloud (IP: 192.168.1.137) admin settings.
- Get 404 page.
The output of your Nextcloud log in Admin > Logging:
Error PHP A non-numeric value encountered at /usr/local/www/nextcloud/apps/serverinfo/lib/OperatingSystems/DefaultOs.php#52
2020-03-13T21:45:49-0400
Error PHP Invalid argument supplied for foreach() at /usr/local/www/nextcloud/apps/joplin/lib/Service/JoplinService.php#128
2020-03-12T22:23:11-0400
Error PHP Undefined index: jsFiles at /usr/local/www/nextcloud/apps/joplin/lib/Service/JoplinService.php#128
2020-03-12T22:23:11-0400
Error PHP Invalid argument supplied for foreach() at /usr/local/www/nextcloud/apps/joplin/lib/Service/JoplinService.php#128
2020-03-12T22:10:01-0400
Error PHP Undefined index: jsFiles at /usr/local/www/nextcloud/apps/joplin/lib/Service/JoplinService.php#128
2020-03-12T22:10:01-0400
Error PHP A non-numeric value encountered at /usr/local/www/nextcloud/apps/serverinfo/lib/OperatingSystems/DefaultOs.php#52
2020-03-12T22:09:42-0400
Error PHP Invalid argument supplied for foreach() at /usr/local/www/nextcloud/apps/joplin/lib/Service/JoplinService.php#128
2020-03-12T22:05:47-0400
Error PHP Undefined index: jsFiles at /usr/local/www/nextcloud/apps/joplin/lib/Service/JoplinService.php#128
2020-03-12T22:05:47-0400
Error PHP Undefined index: appt_pps at /usr/local/www/nextcloud/apps/appointments/templates/public/form.php#14
2020-03-12T22:05:36-0400
Error PHP Undefined index: appt_pps at /usr/local/www/nextcloud/apps/appointments/templates/public/form.php#14
2020-03-12T22:05:24-0400
Error no app in context Exception: Repair step 'OCA\Appointments\InstallHook' is not of type \OCP\Migration\IRepairStep
2020-03-12T21:59:00-0400
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'apps_paths' =>
array (
0 =>
array (
'path' => '/usr/local/www/nextcloud/apps',
'url' => '/apps',
'writable' => true,
),
1 =>
array (
'path' => '/usr/local/www/nextcloud/apps-pkg',
'url' => '/apps-pkg',
'writable' => true,
),
),
'logfile' => '/var/log/nextcloud/nextcloud.log',
'memcache.local' => '\\OC\\Memcache\\APCu',
'instanceid' => REDACTED,
'passwordsalt' => REDACTED,
'secret' => REDACTED,
'trusted_domains' =>
array (
0 => REDACTED,
1 => REDACTED,
2 => REDACTED,
3 => '192.168.1.137',
),
'datadirectory' => '/usr/local/www/nextcloud/data',
'dbtype' => 'mysql',
'version' => '17.0.2.1',
'overwrite.cli.url' => REDACTED,
'overwriteprotocol' => 'https',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => REDACTED,
'dbpassword' => REDACTED,
'installed' => true,
'trusted_proxies' =>
array (
0 => '192.168.1.245',
1 => '192.168.1.119',
),
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'nextcloud',
'mail_domain' =>REDACTED,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'smtp.gmail.com',
'mail_smtpport' => '465',
'mail_smtpname' =>REDACTED,
'mail_smtppassword' =>REDACTED,
'updater.secret' =>REDACTED,
);
I am 99% sure this below is the problem, as I can’t find how to set up the php-handler.
- Nextcloud is in its own jail, installed using the Nextcloud plugin on FreeNAS
- Nginx is on a VM, in Ubuntu 18.04. It acts as a reverse proxy, sorting through my requests and rerouting to various apps (wordpress, bitwarden, plex, nextcloud, etc.)
- I’m not sure how to make Nextcloud and Nginx play nice together. This is an ongoing issue, and since Nextcloud works fine (with the exception of uploading images) I just ignored the issue. But now I can’t upgrade.
The output of your Apache/nginx/system log in /var/log/____:
## Required for line 101-117 ##
#upstream php-handler {
# #server 127.0.0.1:9000;
# server unix:/var/run/nextcloud-php-fpm.sock;
#}
server {
server_name nextcloud.REDACTED;
# The internal IP of the VM that hosts your Apache config
set $upstream 192.168.1.137;
# Add headers to serve security related headers
# Before enabling Strict-Transport-Security headers please read into this
# topic first.
add_header Strict-Transport-Security "max-age=15768000; includeSubDomains;" always;
#
# WARNING: Only add the preload option once you read about
# the consequences in https://hstspreload.org/. This option
# will add the domain to a hardcoded list that is shipped
# in all major browsers and getting removed from this list
# could take several months.
add_header Referrer-Policy "no-referrer" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Download-Options "noopen" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Permitted-Cross-Domain-Policies "none" always;
add_header X-Robots-Tag "none" always;
add_header X-XSS-Protection "1; mode=block" always;
#I found this header is needed on Ubuntu, but not on Arch Linux.
#add_header X-Frame-Options "SAMEORIGIN";
# Remove X-Powered-By, which is an information leak
fastcgi_hide_header X-Powered-By;
# To make reverse proxy work
location / {
proxy_pass_header Authorization;
proxy_pass http://$upstream;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_http_version 1.1;
proxy_set_header Connection “”;
proxy_buffering off;
client_max_body_size 0;
proxy_read_timeout 36000s;
proxy_redirect off;
# rewrite ^ /index.php; # This breaks nextcloud
}
access_log /var/log/nginx/nextcloud.access;
error_log /var/log/nginx/nextcloud.error;
location = /robots.txt {
allow all;
log_not_found off;
access_log off;
}
# The following 2 rules are only needed for the user_webfinger app.
# Uncomment it if you're planning to use this app.
#rewrite ^/.well-known/host-meta /public.php?service=host-meta last;
#rewrite ^/.well-known/host-meta.json /public.php?service=host-meta-json
# last;
# The following rule is only needed for the Social app.
# Uncomment it if you're planning to use this app.
#rewrite ^/.well-known/webfinger /public.php?service=webfinger last;
location = /.well-known/carddav {
return 301 $scheme://$host:$server_port/remote.php/dav;
}
location = /.well-known/caldav {
return 301 $scheme://$host:$server_port/remote.php/dav;
}
# set max upload size
client_max_body_size 512M;
fastcgi_buffers 64 4K;
# Enable gzip but do not remove ETag headers
gzip on;
gzip_vary on;
gzip_comp_level 4;
gzip_min_length 256;
gzip_proxied expired no-cache no-store private no_last_modified no_etag auth;
gzip_types application/atom+xml application/javascript application/json application/ld+json application/manifest+json application/rss+xml application/vnd.geo+json application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/bmp image/svg+xml image/x-icon text/cache-manifest text/css text/plain text/vcard text/vnd.rim.location.xloc text/vtt text/x-component text/x-cross-domain-policy;
# Uncomment if your server is build with the ngx_pagespeed module
# This module is currently not supported.
#pagespeed off;
location ~ ^\/(?:build|tests|config|lib|3rdparty|templates|data)\/ {
deny all;
}
location ~ ^\/(?:\.|autotest|occ|issue|indie|db_|console) {
deny all;
}
## This doesnt work cuz IDK how to set php-handler to 192.168.1.137 ##
# location ~ ^\/(?:index|remote|public|cron|core\/ajax\/update|status|ocs\/v[12]|updater\/.+|oc[ms]-provider\/.+)\.php(?:$|\/) {
# 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 $path_info;
# fastcgi_param HTTPS on;
# # Avoid sending the security headers twice
# fastcgi_param modHeadersAvailable true;
# # Enable pretty urls
# fastcgi_param front_controller_active true;
# fastcgi_pass php-handler;
# fastcgi_intercept_errors on;
# fastcgi_request_buffering off;
# }
location ~ ^\/(?:updater|oc[ms]-provider)(?:$|\/) {
try_files $uri/ =404;
index index.php;
}
## Breaks the login page if no php-handler ##
# Adding the cache control header for js, css and map files
# Make sure it is BELOW the PHP block
# location ~ \.(?:css|js|woff2?|svg|gif|map)$ {
# try_files $uri /index.php$request_uri;
# add_header Cache-Control "public, max-age=15778463";
# Add headers to serve security related headers (It is intended to
# have those duplicated to the ones above)
# Before enabling Strict-Transport-Security headers please read into
# this topic first.
#add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload;" always;
#
# WARNING: Only add the preload option once you read about
# the consequences in https://hstspreload.org/. This option
# will add the domain to a hardcoded list that is shipped
# in all major browsers and getting removed from this list
# could take several months.
# 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;
# Optional: Don't log access to assets
# access_log off;
# }
location ~ \.(?:png|html|ttf|ico|jpg|jpeg|bcmap)$ {
try_files $uri /index.php$request_uri;
# Optional: Don't log access to other assets
access_log off;
}
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/russell.work/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/russell.work/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
server {
if ($host = nextcloud.REDACTED) {
return 301 https://$host$request_uri;
} # managed by Certbot
server_name nextcloud.REDACTED;
listen 80;
return 404; # managed by Certbot
}