diff --git a/install/dist/conf/debian110.conf.php b/install/dist/conf/debian110.conf.php
new file mode 100644
index 000000000..c60152df5
--- /dev/null
+++ b/install/dist/conf/debian110.conf.php
@@ -0,0 +1,239 @@
+<?php
+
+/*
+Copyright (c) 2021, Till Brehm, ISPConfig UG
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+    * Neither the name of ISPConfig nor the names of its contributors
+      may be used to endorse or promote products derived from this software without
+      specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+//***  Debian 11 default settings
+
+//* Main
+$conf['language'] = 'en';
+$conf['distname'] = 'debian110';
+$conf['hostname'] = 'server1.domain.tld'; // Full hostname
+$conf['ispconfig_install_dir'] = '/usr/local/ispconfig';
+$conf['ispconfig_config_dir'] = '/usr/local/ispconfig';
+$conf['ispconfig_log_priority'] = 2;  // 0 = Debug, 1 = Warning, 2 = Error
+$conf['ispconfig_log_dir'] = '/var/log/ispconfig';
+$conf['server_id'] = 1;
+$conf['init_scripts'] = '/etc/init.d';
+$conf['runlevel'] = '/etc';
+$conf['shells'] = '/etc/shells';
+$conf['pam'] = '/etc/pam.d';
+
+//* Services provided by this server, this selection will be overridden by the expert mode
+$conf['services']['mail'] = true;
+$conf['services']['web'] = true;
+$conf['services']['dns'] = true;
+$conf['services']['file'] = true;
+$conf['services']['db'] = true;
+$conf['services']['vserver'] = true;
+$conf['services']['proxy'] = false;
+$conf['services']['firewall'] = false;
+
+//* MySQL
+$conf['mysql']['installed'] = false; // will be detected automatically during installation
+$conf['mysql']['init_script'] = 'mysql';
+$conf['mysql']['host'] = 'localhost';
+$conf['mysql']['ip'] = '127.0.0.1';
+$conf['mysql']['port'] = '3306';
+$conf['mysql']['database'] = 'dbispconfig';
+$conf['mysql']['admin_user'] = 'root';
+$conf['mysql']['admin_password'] = '';
+$conf['mysql']['charset'] = 'utf8';
+$conf['mysql']['ispconfig_user'] = 'ispconfig';
+$conf['mysql']['ispconfig_password'] = md5(uniqid(rand()));
+$conf['mysql']['master_slave_setup'] = 'n';
+$conf['mysql']['master_host'] = '';
+$conf['mysql']['master_database'] = 'dbispconfig';
+$conf['mysql']['master_admin_user'] = 'root';
+$conf['mysql']['master_admin_password'] = '';
+$conf['mysql']['master_ispconfig_user'] = '';
+$conf['mysql']['master_ispconfig_password'] = md5(uniqid(rand()));
+
+//* Apache
+$conf['apache']['installed'] = false; // will be detected automatically during installation
+$conf['apache']['user'] = 'www-data';
+$conf['apache']['group'] = 'www-data';
+$conf['apache']['init_script'] = 'apache2';
+$conf['apache']['version'] = '2.4';
+$conf['apache']['vhost_conf_dir'] = '/etc/apache2/sites-available';
+$conf['apache']['vhost_conf_enabled_dir'] = '/etc/apache2/sites-enabled';
+$conf['apache']['vhost_port'] = '8080';
+$conf['apache']['php_ini_path_apache'] = '/etc/php/7.4/apache2/php.ini';
+$conf['apache']['php_ini_path_cgi'] = '/etc/php/7.4/cgi/php.ini';
+
+//* Website base settings
+$conf['web']['website_basedir'] = '/var/www';
+$conf['web']['website_path'] = '/var/www/clients/client[client_id]/web[website_id]';
+$conf['web']['website_symlinks'] = '/var/www/[website_domain]/:/var/www/clients/client[client_id]/[website_domain]/';
+
+//* Apps base settings
+$conf['web']['apps_vhost_ip'] = '_default_';
+$conf['web']['apps_vhost_port'] = '8081';
+$conf['web']['apps_vhost_servername'] = '';
+$conf['web']['apps_vhost_user'] = 'ispapps';
+$conf['web']['apps_vhost_group'] = 'ispapps';
+
+//* Fastcgi
+$conf['fastcgi']['fastcgi_phpini_path'] = '/etc/php/7.4/cgi/';
+$conf['fastcgi']['fastcgi_starter_path'] = '/var/www/php-fcgi-scripts/[system_user]/';
+$conf['fastcgi']['fastcgi_bin'] = '/usr/bin/php-cgi';
+
+//* Postfix
+$conf['postfix']['installed'] = false; // will be detected automatically during installation
+$conf['postfix']['config_dir'] = '/etc/postfix';
+$conf['postfix']['init_script'] = 'postfix';
+$conf['postfix']['user'] = 'postfix';
+$conf['postfix']['group'] = 'postfix';
+$conf['postfix']['vmail_userid'] = '5000';
+$conf['postfix']['vmail_username'] = 'vmail';
+$conf['postfix']['vmail_groupid'] = '5000';
+$conf['postfix']['vmail_groupname'] = 'vmail';
+$conf['postfix']['vmail_mailbox_base'] = '/var/vmail';
+
+//* Mailman
+$conf['mailman']['installed'] = false; // will be detected automatically during installation
+$conf['mailman']['config_dir'] = '/etc/mailman';
+$conf['mailman']['init_script'] = 'mailman';
+
+//* mlmmj
+$conf['mlmmj']['installed'] = false; // will be detected automatically during installation
+$conf['mlmmj']['config_dir'] = '/etc/mlmmj';
+
+//* Getmail
+$conf['getmail']['installed'] = false; // will be detected automatically during installation
+$conf['getmail']['config_dir'] = '/etc/getmail';
+$conf['getmail']['program'] = '/usr/bin/getmail';
+
+//* Courier
+$conf['courier']['installed'] = false; // will be detected automatically during installation
+$conf['courier']['config_dir'] = '/etc/courier';
+$conf['courier']['courier-authdaemon'] = 'courier-authdaemon';
+$conf['courier']['courier-imap'] = 'courier-imap';
+$conf['courier']['courier-imap-ssl'] = 'courier-imap-ssl';
+$conf['courier']['courier-pop'] = 'courier-pop';
+$conf['courier']['courier-pop-ssl'] = 'courier-pop-ssl';
+
+//* Dovecot
+$conf['dovecot']['installed'] = false; // will be detected automatically during installation
+$conf['dovecot']['config_dir'] = '/etc/dovecot';
+$conf['dovecot']['init_script'] = 'dovecot';
+
+//* SASL
+$conf['saslauthd']['installed'] = false; // will be detected automatically during installation
+$conf['saslauthd']['config'] = '/etc/default/saslauthd';
+$conf['saslauthd']['init_script'] = 'saslauthd';
+
+//* Amavisd
+$conf['amavis']['installed'] = false; // will be detected automatically during installation
+$conf['amavis']['config_dir'] = '/etc/amavis';
+$conf['amavis']['init_script'] = 'amavis';
+
+//* Rspamd
+$conf['rspamd']['installed'] = false; // will be detected automatically during installation
+$conf['rspamd']['config_dir'] = '/etc/rspamd';
+$conf['rspamd']['init_script'] = 'rspamd';
+
+//* ClamAV
+$conf['clamav']['installed'] = false; // will be detected automatically during installation
+$conf['clamav']['init_script'] = 'clamav-daemon';
+
+//* Pureftpd
+$conf['pureftpd']['installed'] = false; // will be detected automatically during installation
+$conf['pureftpd']['config_dir'] = '/etc/pure-ftpd';
+$conf['pureftpd']['init_script'] = 'pure-ftpd-mysql';
+
+//* MyDNS
+$conf['mydns']['installed'] = false; // will be detected automatically during installation
+$conf['mydns']['config_dir'] = '/etc';
+$conf['mydns']['init_script'] = 'mydns';
+
+//* PowerDNS
+$conf['powerdns']['installed'] = false; // will be detected automatically during installation
+$conf['powerdns']['database'] = 'powerdns';
+$conf["powerdns"]["config_dir"] = '/etc/powerdns/pdns.d';
+$conf['powerdns']['init_script'] = 'pdns';
+
+//* BIND DNS Server
+$conf['bind']['installed'] = false; // will be detected automatically during installation
+$conf['bind']['bind_user'] = 'root';
+$conf['bind']['bind_group'] = 'bind';
+$conf['bind']['bind_zonefiles_dir'] = '/etc/bind';
+$conf['bind']['named_conf_path'] = '/etc/bind/named.conf';
+$conf['bind']['named_conf_local_path'] = '/etc/bind/named.conf.local';
+$conf['bind']['init_script'] = 'bind9';
+
+//* Jailkit
+$conf['jailkit']['installed'] = false; // will be detected automatically during installation
+$conf['jailkit']['config_dir'] = '/etc/jailkit';
+$conf['jailkit']['jk_init'] = 'jk_init.ini';
+$conf['jailkit']['jk_chrootsh'] = 'jk_chrootsh.ini';
+$conf['jailkit']['jailkit_chroot_app_programs'] = '/usr/bin/groups /usr/bin/id /usr/bin/dircolors /usr/bin/lesspipe /usr/bin/basename /usr/bin/dirname /usr/bin/nano /usr/bin/pico /usr/bin/mysql /usr/bin/mysqldump /usr/bin/git /usr/bin/git-receive-pack /usr/bin/git-upload-pack /usr/bin/unzip /usr/bin/zip /bin/tar /bin/rm /usr/bin/patch';
+$conf['jailkit']['jailkit_chroot_cron_programs'] = '/usr/bin/php /usr/bin/perl /usr/share/perl /usr/share/php';
+
+//* Squid
+$conf['squid']['installed'] = false; // will be detected automatically during installation
+$conf['squid']['config_dir'] = '/etc/squid';
+$conf['squid']['init_script'] = 'squid';
+
+//* Nginx
+$conf['nginx']['installed'] = false; // will be detected automatically during installation
+$conf['nginx']['user'] = 'www-data';
+$conf['nginx']['group'] = 'www-data';
+$conf['nginx']['config_dir'] = '/etc/nginx';
+$conf['nginx']['vhost_conf_dir'] = '/etc/nginx/sites-available';
+$conf['nginx']['vhost_conf_enabled_dir'] = '/etc/nginx/sites-enabled';
+$conf['nginx']['init_script'] = 'nginx';
+$conf['nginx']['vhost_port'] = '8080';
+$conf['nginx']['cgi_socket'] = '/var/run/fcgiwrap.socket';
+$conf['nginx']['php_fpm_init_script'] = 'php7.4-fpm';
+$conf['nginx']['php_fpm_ini_path'] = '/etc/php/7.4/fpm/php.ini';
+$conf['nginx']['php_fpm_pool_dir'] = '/etc/php/7.4/fpm/pool.d';
+$conf['nginx']['php_fpm_start_port'] = 9010;
+$conf['nginx']['php_fpm_socket_dir'] = '/var/lib/php7.4-fpm';
+
+//* OpenVZ
+$conf['openvz']['installed'] = false;
+
+//*Bastille-Firwall
+$conf['bastille']['installed'] = false;
+$conf['bastille']['config_dir'] = '/etc/Bastille';
+
+//* vlogger
+$conf['vlogger']['config_dir'] = '/etc';
+
+//* cron
+$conf['cron']['init_script'] = 'cron';
+$conf['cron']['crontab_dir'] = '/etc/cron.d';
+$conf['cron']['wget'] = '/usr/bin/wget';
+
+//* Metronome XMPP
+$conf['xmpp']['installed'] = false;
+$conf['xmpp']['init_script'] = 'metronome';
+
+
+?>
diff --git a/install/dist/conf/debiantesting.conf.php b/install/dist/conf/debiantesting.conf.php
index 6ea9112df..cbc380fff 100644
--- a/install/dist/conf/debiantesting.conf.php
+++ b/install/dist/conf/debiantesting.conf.php
@@ -32,7 +32,7 @@
 
 //* Main
 $conf['language'] = 'en';
-$conf['distname'] = 'debian100';
+$conf['distname'] = 'debian110';
 $conf['hostname'] = 'server1.domain.tld'; // Full hostname
 $conf['ispconfig_install_dir'] = '/usr/local/ispconfig';
 $conf['ispconfig_config_dir'] = '/usr/local/ispconfig';
@@ -83,8 +83,8 @@
 $conf['apache']['vhost_conf_dir'] = '/etc/apache2/sites-available';
 $conf['apache']['vhost_conf_enabled_dir'] = '/etc/apache2/sites-enabled';
 $conf['apache']['vhost_port'] = '8080';
-$conf['apache']['php_ini_path_apache'] = '/etc/php/7.3/apache2/php.ini';
-$conf['apache']['php_ini_path_cgi'] = '/etc/php/7.3/cgi/php.ini';
+$conf['apache']['php_ini_path_apache'] = '/etc/php/7.4/apache2/php.ini';
+$conf['apache']['php_ini_path_cgi'] = '/etc/php/7.4/cgi/php.ini';
 
 //* Website base settings
 $conf['web']['website_basedir'] = '/var/www';
@@ -99,7 +99,7 @@
 $conf['web']['apps_vhost_group'] = 'ispapps';
 
 //* Fastcgi
-$conf['fastcgi']['fastcgi_phpini_path'] = '/etc/php/7.3/cgi/';
+$conf['fastcgi']['fastcgi_phpini_path'] = '/etc/php/7.4/cgi/';
 $conf['fastcgi']['fastcgi_starter_path'] = '/var/www/php-fcgi-scripts/[system_user]/';
 $conf['fastcgi']['fastcgi_bin'] = '/usr/bin/php-cgi';
 
@@ -210,11 +210,11 @@
 $conf['nginx']['init_script'] = 'nginx';
 $conf['nginx']['vhost_port'] = '8080';
 $conf['nginx']['cgi_socket'] = '/var/run/fcgiwrap.socket';
-$conf['nginx']['php_fpm_init_script'] = 'php7.3-fpm';
-$conf['nginx']['php_fpm_ini_path'] = '/etc/php/7.3/fpm/php.ini';
-$conf['nginx']['php_fpm_pool_dir'] = '/etc/php/7.3/fpm/pool.d';
+$conf['nginx']['php_fpm_init_script'] = 'php7.4-fpm';
+$conf['nginx']['php_fpm_ini_path'] = '/etc/php/7.4/fpm/php.ini';
+$conf['nginx']['php_fpm_pool_dir'] = '/etc/php/7.4/fpm/pool.d';
 $conf['nginx']['php_fpm_start_port'] = 9010;
-$conf['nginx']['php_fpm_socket_dir'] = '/var/lib/php7.3-fpm';
+$conf['nginx']['php_fpm_socket_dir'] = '/var/lib/php7.4-fpm';
 
 //* OpenVZ
 $conf['openvz']['installed'] = false;
diff --git a/install/lib/install.lib.php b/install/lib/install.lib.php
index 7a4993960..6ff32bb78 100644
--- a/install/lib/install.lib.php
+++ b/install/lib/install.lib.php
@@ -238,6 +238,13 @@ function get_distname() {
 			$distid = 'debian60';
 			$distbaseid = 'debian';
 			swriteln("Operating System: Debian 10.0 (Buster) or compatible\n");
+		} elseif(substr(trim(file_get_contents('/etc/debian_version')),0,2) == '11') {
+			$distname = 'Debian';
+			$distver = 'Bullseye';
+			$distconfid = 'debian110';
+			$distid = 'debian60';
+			$distbaseid = 'debian';
+			swriteln("Operating System: Debian 11.0 (Bullseye) or compatible\n");
 		} elseif(strstr(trim(file_get_contents('/etc/debian_version')), '/sid')) {
 			$distname = 'Debian';
 			$distver = 'Testing';
diff --git a/server/lib/classes/monitor_tools.inc.php b/server/lib/classes/monitor_tools.inc.php
index 9d7a22574..42ed9146e 100644
--- a/server/lib/classes/monitor_tools.inc.php
+++ b/server/lib/classes/monitor_tools.inc.php
@@ -221,6 +221,12 @@ function get_distname() {
 			$distconfid = 'debian100';
 			$distid = 'debian60';
 			$distbaseid = 'debian';
+		} elseif(substr(trim(file_get_contents('/etc/debian_version')),0,2) == '11') {
+			$distname = 'Debian';
+			$distver = 'Bullseye';
+			$distconfid = 'debian110';
+			$distid = 'debian60';
+			$distbaseid = 'debian';
 		} elseif(strstr(trim(file_get_contents('/etc/debian_version')), '/sid')) {
 			$distname = 'Debian';
 			$distver = 'Testing';