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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, 15.0.1):
Operating system and version (eg, Debian 9 (Stretch)):
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, PHP 7.3.0-2+0~20181217092659.24+stretch~1.gbp54e52f (cli)):
The issue you are facing:
I upgraded from version 14.0.6 to version 15.0.1.
I also updated php7.0 to php7.3, after having everything installed and checked, my cloud was accessible with firefox.
This morning wanted to access it, I have a blank page. When I ping the server ip, ok.
When I ping the root of the domain name ok
When I ping the domain name of the cloud it tells me waiting time exceeded: Not ok
Synchronization no longer works on my mobile
Is this the first time you’ve seen this error? (Y/N):
Yes
Steps to replicate it:
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!):
<?php
$CONFIG = array (
'instanceid' => ''--------@',
'passwordsalt' => ''--------@',
'secret' => ''--------@'--------@',
'trusted_domains' =>
array (
0 => 'lenuage.ponticelli.blue',
),
'datadirectory' => '/var/www/'--------@/data',
'dbtype' => 'mysql',
'version' => '15.0.1.1',
'overwrite.cli.url' => 'https://lenuage.ponticelli.blue',
'dbname' => ''--------@',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => ''--------@',
'dbpassword' => ''--------@',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_from_address' => 'lenuage',
'mail_domain' => 'ponticelli.blue',
'mail_smtpauth' => 1,
'mail_smtphost' => 'ssl0.ovh.net',
'mail_smtpport' => '465',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpname' => '--------@ponticelli.blue',
'mail_smtppassword' => '---------------',
'memcache.local' => '\\OC\\Memcache\\ArrayCache',
'htaccess.RewriteBase' => '/',
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'updater.release.channel' => 'stable',
'updater.secret' => '$'--------@',
);
The output of your Apache/nginx/system log in /var/log/____:
[Mon Jan 14 15:24:13.989727 2019] [core:warn] [pid 8041] AH00111: Config variable ${APACHE_RUN_DIR} is not defined
apache2: Syntax error on line 80 of /etc/apache2/apache2.conf: DefaultRuntimeDir must be a valid directory, absolute or relative to ServerRoot
I get that by typing the following command
apt show php
Package: php
Version: 2:7.2+69+0~20181217103149.12+stretch~1.gbpfa617b
Priority: optional
Section: php
Source: php-defaults (69+0~20181217103149.12+stretch~1.gbpfa617b)
Maintainer: Debian PHP Maintainers team+pkg-php@tracker.debian.org
Installed-Size: 13.3 kB
Depends: php7.2
Download-Size: 6122 B
APT-Sources: https://packages.sury.org/php stretch/main amd64 Packages
Description: server-side, HTML-embedded scripting language (default)
PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used
open source general-purpose scripting language that is especially suited
for web development and can be embedded into HTML.
.
This package is a dependency package, which depends on latest stable
PHP version (currently 7.2).
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