Site fails to redirects to Settings/Admin, went to https://settings/admin instead

Nextcloud version: 12.0.3
Operating system and version: Ubuntu 17.04
Apache or nginx version: nginx/1.10.2 (Ubuntu)
PHP version: 7.1
Is this the first time you’ve seen this error? Yes

How to replicate:

  1. Go to Admin, choose Cron
  2. Click the Gear icon, then choose Admin

The issue you are facing:
When selected Admin, the website redirects to https://settings/admin instead of a proper address
If selected Personal (or anything else), it works properly (proper redirection)

The output of your Nextcloud log in Admin > Logging: (can’t enter Admin!)

The output of your config.php file in /var/www/html:

<?php
$CONFIG = array (
  'instanceid' => 'oczuehbpkc2y',
  'passwordsalt' => '6pej4Fv8jZrblnIBGoXr4w5znEf+bg',
  'secret' => 'JesVpXzVIucTSq4CWi5HzXY5O/PC6zOm4Do+i0ySSiQJ0Zd3',
  'trusted_domains' => 
  array (
    0 => 'dtf2second.ddns.net',
  ),
  'datadirectory' => '/var/www/html/data',
  'overwrite.cli.url' => 'https://dtf2second.ddns.net',
  'dbtype' => 'mysql',
  'version' => '12.0.3.3',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost:3306',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'oc_proto1',
  'dbpassword' => 'Qet2BjCy2fBgH875z5+kZC0NasiKOd',
  'installed' => true,
);

The output of nginx log in /var/log/nginx/main-website.error.log:

2017/11/26 23:41:08 [error] 27370#27370: *224 connect() failed (111: Connection refused) while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/2.0", upstream: "fastcgi://127.0.0.1:3306", host: "dtf2second.ddns.net"
2017/11/26 23:41:08 [error] 27370#27370: *224 upstream sent unsupported FastCGI protocol version: 106 while reading response header from upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/2.0", upstream: "fastcgi://unix:/var/run/mysqld/mysqld.sock:", host: "dtf2second.ddns.net"
2017/11/26 23:41:08 [error] 27370#27370: *224 no live upstreams while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/2.0", upstream: "fastcgi://php-handler", host: "dtf2second.ddns.net"
2017/11/26 23:41:11 [error] 27370#27370: *254 connect() failed (111: Connection refused) while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:3306", host: "dtf2second.ddns.net"
2017/11/26 23:41:11 [error] 27370#27370: *254 upstream sent unsupported FastCGI protocol version: 106 while reading response header from upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/mysqld/mysqld.sock:", host: "dtf2second.ddns.net"
2017/11/26 23:41:11 [error] 27370#27370: *254 no live upstreams while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://php-handler", host: "dtf2second.ddns.net"
2017/11/26 23:41:11 [error] 27370#27370: *254 connect() failed (111: Connection refused) while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:3306", host: "dtf2second.ddns.net"
2017/11/26 23:41:11 [error] 27370#27370: *254 upstream sent unsupported FastCGI protocol version: 106 while reading response header from upstream, client: myip, server: dtf2second.ddns.net, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://unix:/var/run/mysqld/mysqld.sock:", host: "dtf2second.ddns.net"
2017/11/26 23:42:48 [error] 27370#27370: *259 connect() failed (111: Connection refused) while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:3306", host: "dtf2second.ddns.net"
2017/11/26 23:42:48 [error] 27370#27370: *259 upstream sent unsupported FastCGI protocol version: 106 while reading response header from upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/mysqld/mysqld.sock:", host: "dtf2second.ddns.net"
2017/11/26 23:42:49 [error] 27370#27370: *259 no live upstreams while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://php-handler", host: "dtf2second.ddns.net"
2017/11/26 23:42:49 [error] 27370#27370: *259 connect() failed (111: Connection refused) while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:3306", host: "dtf2second.ddns.net"
2017/11/26 23:42:49 [error] 27370#27370: *259 upstream sent unsupported FastCGI protocol version: 106 while reading response header from upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/mysqld/mysqld.sock:", host: "dtf2second.ddns.net"
2017/11/26 23:42:49 [error] 27370#27370: *259 no live upstreams while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://php-handler", host: "dtf2second.ddns.net"
2017/11/26 23:51:52 [error] 31226#31226: *269 access forbidden by rule, client: myip, server: , request: "GET /data/.ocdata?t=1511769112775 HTTP/2.0", host: "dtf2second.ddns.net"
2017/11/26 23:52:08 [error] 31226#31226: *269 access forbidden by rule, client: myip, server: , request: "GET /data/.ocdata?t=1511769128383 HTTP/2.0", host: "dtf2second.ddns.net"

The output of nginx log in /var/log/nginx/main-website.access.log:

myip - - [27/Nov/2017:00:07:22 -0800] "GET /apps/gallery/config?extramediatypes=1 HTTP/2.0" 200 665 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:22 -0800] "PROPFIND /remote.php/webdav/ HTTP/2.0" 207 4050 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:22 -0800] "GET /index.php/apps/files/ajax/getstoragestats.php?dir=%2F HTTP/2.0" 200 766 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:23 -0800] "GET /apps/systemtags/lastused HTTP/2.0" 200 563 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:27 -0800] "DELETE /remote.php/webdav/Documents HTTP/2.0" 204 292 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:27 -0800] "DELETE /remote.php/webdav/Photos HTTP/2.0" 204 292 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:27 -0800] "DELETE /remote.php/webdav/Nextcloud%20Manual.pdf HTTP/2.0" 204 292 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:27 -0800] "DELETE /remote.php/webdav/Nextcloud.mp4 HTTP/2.0" 204 292 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:27 -0800] "GET /index.php/apps/files/ajax/getstoragestats.php?dir=%2F HTTP/2.0" 200 767 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:07:53 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 960 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:20 -0800] "GET /apps/files/?dir=/&fileid=7 HTTP/2.0" 303 579 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:20 -0800] "GET /apps/files/?dir=/ HTTP/2.0" 200 6903 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:21 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 960 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:21 -0800] "GET /apps/gallery/config?extramediatypes=1 HTTP/2.0" 200 665 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:21 -0800] "PROPFIND /remote.php/webdav/ HTTP/2.0" 207 1142 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:21 -0800] "GET /index.php/apps/files/ajax/getstoragestats.php?dir=%2F HTTP/2.0" 200 767 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:21 -0800] "GET /apps/systemtags/lastused HTTP/2.0" 200 563 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:22 -0800] "GET /settings/personal HTTP/2.0" 200 10329 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:23 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 960 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:23 -0800] "GET /settings/personal/authtokens HTTP/2.0" 200 747 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:25 -0800] "GET /settings/apps HTTP/2.0" 200 6028 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:26 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 960 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:27 -0800] "GET /settings/apps/list?category=installed HTTP/2.0" 200 8855 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:27 -0800] "GET /settings/apps/categories HTTP/2.0" 200 906 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:50 -0800] "GET /settings/users HTTP/2.0" 200 6197 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:51 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 960 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:51 -0800] "GET /settings/users/users?offset=0&limit=50&gid=&pattern= HTTP/2.0" 200 786 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:08:51 -0800] "GET /settings/users/stats HTTP/2.0" 200 576 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:01 -0800] "POST /login/confirm HTTP/2.0" 200 586 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:13 -0800] "POST /settings/users/proto/displayName HTTP/2.0" 200 683 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:13 -0800] "GET /avatar/proto/32?v=0 HTTP/2.0" 200 593 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:14 -0800] "POST /index.php/settings/ajax/setquota.php HTTP/2.0" 200 680 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:21 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 960 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:26 -0800] "POST /ocs/v2.php/apps/survey_client/api/v1/monthly HTTP/2.0" 200 693 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:29 -0800] "GET /index.php/settings/personal HTTP/2.0" 200 10343 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:30 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 695 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:30 -0800] "GET /settings/personal/authtokens HTTP/2.0" 200 747 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:09:37 -0800] "PUT /settings/users/proto/settings HTTP/2.0" 200 760 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:10:00 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 696 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:10:24 -0800] "DELETE /ocs/v2.php/apps/notifications/api/v2/notifications/2 HTTP/2.0" 200 421 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:30 -0800] "GET /index.php/settings/personal HTTP/2.0" 200 10339 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:30 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:30 -0800] "GET /settings/personal/authtokens HTTP/2.0" 200 748 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:33 -0800] "GET /settings/help HTTP/2.0" 200 4686 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:33 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:34 -0800] "GET /core/doc/user/_static/ HTTP/2.0" 302 600 "https://dtf2second.ddns.net/core/doc/user/index.html" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:34 -0800] "GET /apps/files/ HTTP/2.0" 200 6964 "https://dtf2second.ddns.net/core/doc/user/index.html" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:39 -0800] "GET /settings/help?mode=admin HTTP/2.0" 200 4689 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:40 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:40 -0800] "GET /core/doc/admin/_static/ HTTP/2.0" 302 601 "https://dtf2second.ddns.net/core/doc/admin/index.html" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:40 -0800] "GET /apps/files/ HTTP/2.0" 200 6957 "https://dtf2second.ddns.net/core/doc/admin/index.html" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:47 -0800] "GET / HTTP/2.0" 302 599 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:47 -0800] "GET /apps/files/ HTTP/2.0" 200 6969 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:47 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:47 -0800] "GET /apps/gallery/config?extramediatypes=1 HTTP/2.0" 200 662 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:47 -0800] "PROPFIND /remote.php/webdav/ HTTP/2.0" 207 1147 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:48 -0800] "GET /apps/systemtags/lastused HTTP/2.0" 200 563 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:12:48 -0800] "GET /index.php/apps/files/ajax/getstoragestats.php?dir=%2F HTTP/2.0" 200 774 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:13:18 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:13:48 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:15:11 -0800] "GET /apps/files/?dir=/&fileid=7 HTTP/2.0" 303 581 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:15:11 -0800] "GET /apps/files/?dir=/ HTTP/2.0" 200 6960 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:15:12 -0800] "GET /apps/gallery/config?extramediatypes=1 HTTP/2.0" 200 662 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:15:12 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:15:12 -0800] "PROPFIND /remote.php/webdav/ HTTP/2.0" 207 1147 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:15:12 -0800] "GET /apps/systemtags/lastused HTTP/2.0" 200 560 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:15:12 -0800] "GET /index.php/apps/files/ajax/getstoragestats.php?dir=%2F HTTP/2.0" 200 772 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:15:43 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:16:13 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:16:43 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"
myip - - [27/Nov/2017:00:17:13 -0800] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 450 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0"

NGINX Config (well, part of):

add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection "1; mode=block";
add_header X-Robots-Tag none;
add_header X-Download-Options noopen;
add_header X-Permitted-Cross-Domain-Policies none;

location = /robots.txt {
    allow all;
    log_not_found off;
    access_log off;
}

location = /.well-known/carddav {
  return 301 $scheme://$host/remote.php/dav;
}
location = /.well-known/caldav {
  return 301 $scheme://$host/remote.php/dav;
}

client_max_body_size 512M;
fastcgi_buffers 64 4K;

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;

location / {
    rewrite ^ /index.php$uri;
}

location ~ ^/(?:build|tests|config|lib|3rdparty|templates|data)/ {
    deny all;
}
location ~ ^/(?:\.|autotest|occ|issue|indie|db_|console) {
    deny all;
}

location ~ ^/(?:index|remote|public|cron|core/ajax/update|status|ocs/v[12]|updater/.+|ocs-provider/.+)\.php(?:$|/) {
    fastcgi_split_path_info ^(.+\.php)(/.*)$;
    include fcgi.conf;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO $fastcgi_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 ~ ^/(?:updater|ocs-provider)(?:$|/) {
    try_files $uri/ =404;
    index index.php;
}

location ~ \.(?:css|js|woff|svg|gif)$ {
    try_files $uri /index.php$uri$is_args$args;
    add_header Cache-Control "public, max-age=15778463";
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Robots-Tag none;
    add_header X-Download-Options noopen;
    add_header X-Permitted-Cross-Domain-Policies none;
    access_log off;
}

location ~ \.(?:png|html|ttf|ico|jpg|jpeg)$ {
    try_files $uri /index.php$uri$is_args$args;
    access_log off;
}

You might notice the

2017/11/26 23:42:49 [error] 27370#27370: *259 upstream sent unsupported FastCGI protocol version: 106 while reading response header from upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/mysqld/mysqld.sock:", host: "dtf2second.ddns.net"
2017/11/26 23:42:49 [error] 27370#27370: *259 no live upstreams while connecting to upstream, client: myip, server: dtf2second.ddns.net, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://php-handler", host: "dtf2second.ddns.net"

on top. That problem is fixed.

The entire thing is solved. crontab -u www-data -e did not work, so I did sudo vim /etc/cron.daily/nextcloud, put the Crontab line in, wait for a while and it fixed itself.