Server Not Found Error

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Nextcloud version 17.0.1
Operating system and version: Ubuntu 18.04 Server
Apache or nginx version nginx 1.14.0
PHP version 7.2

The issue you are facing:

I’ve recently setup Nextcloud on a VPS and it’s been live for 24 hours or so. I’ve uploaded lots of data over the last day but this afternoon I received the following error from my Ubuntu client app - "No connection to Nextcloud at Host not found."
Then a few moments later the browser app stopped working and I just have a server not found error in my browser when I attempt to connect to my domain.
My VPS is working fine, I can SSH into the server and see all of the nextcloud config.

Is this the first time you’ve seen this error? Yes

Steps to replicate it:

  1. Use the browser to connect to nextcloud.
  2. Use the nextcloud client app to sync files.

The output of your Nextcloud log in Admin > Logging:

Unable to retrieve.

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

$CONFIG = array (
  'instanceid' => '#####',
  'passwordsalt' => '#####',
  'secret' => '#####',
  'trusted_domains' => 
  array (
    0 => '',
  'datadirectory' => '/usr/share/nginx/nextcloud-data',
  'dbtype' => 'mysql',
  'version' => '',
  'overwrite.cli.url' => '',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'nextclouduser',
  'dbpassword' => '###',
  'installed' => true,
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'localhost',
    'port' => 6379,
  'mysql.utf8mb4' => true,
  'maintenance' => false,

The output of your Apache/nginx/system log in /var/log/____:

Sorry, not sure which file it should be from those available in /var/log/ or var/log/nginx