8080 Server refused to connect.

could anyone throw some light? I am encountering this issue after installing Ispconfig on Debian 10 by following the perfect server. hopefully, i didn't miss any steps.
the attached is the virtualhost config

 

Thank you Till!
I got the following. :8080 not listening. I had two attempts, no luck:
1) tried to add 8080 to /etc/apache2/ports.conf. however, it guided me to the Apache test page directly.
2) add the following scripts to /etc/apache2/sites-available/ virtual.isp3.conf (newly added)
<VirtualHost *:8080>
ServerName xyzsss.com
ServerAlias www.xyzsss.com *.xyzsss.com
DocumentRoot /path/to/isp3/
</VirtualHost>

just don't know how to continue.


##### SCRIPT FINISHED #####
Results can be found in htf_report.txt
To view results use your favourite text editor or type 'cat htf_report.txt | more' on the server console.

If you want to see the non-anonymized output start the script with --debug as parameter (php -q htf-common-issues.php --debug).

[email protected]:~# cat htf_report.txt | more

##### SERVER #####
IP-address (as per hostname): ***.***.***.***
[WARN] could not determine server's ip address by ifconfig
[INFO] OS version is Debian GNU/Linux 10 (buster)

[INFO] ISPConfig is installed.

##### ISPCONFIG #####
ISPConfig version is 3.2.2


##### VERSION CHECK #####

[INFO] php (cli) version is 7.3.19-1~deb10u1

##### PORT CHECK #####

[WARN] Port 8080 (ISPConfig) seems NOT to be listening
[WARN] Port 8081 (ISPConfig Apps) seems NOT to be listening

##### MAIL SERVER CHECK #####


##### RUNNING SERVER PROCESSES #####

[INFO] I found the following web server(s):
Apache 2 (PID 1656)
[INFO] I found the following mail server(s):
Postfix (PID 1182)
[INFO] I found the following pop3 server(s):
Dovecot (PID 750)
[INFO] I found the following imap server(s):
Dovecot (PID 750)
[INFO] I found the following ftp server(s):
PureFTP (PID 1220)

##### LISTENING PORTS #####
(only ()
Local (Address)
[anywhere]:993 (750/dovecot)
[anywhere]:995 (750/dovecot)
[anywhere]:587 (1182/master)
[localhost]:11211 (615/memcached)
[anywhere]:110 (750/dovecot)
[anywhere]:143 (750/dovecot)
[anywhere]:465 (1182/master)
[anywhere]:21 (1220/pure-ftpd)
***.***.***.***:53 (649/named)
[localhost]:53 (649/named)
[anywhere]:22 (657/sshd)
[anywhere]:25 (1182/master)
[localhost]:953 (649/named)
*:*:*:*::*:443 (1656/apache2)
*:*:*:*::*:993 (750/dovecot)
*:*:*:*::*:995 (750/dovecot)
*:*:*:*::*:3306 (712/mysqld)
*:*:*:*::*:587 (1182/master)
[localhost]10 (750/dovecot)
[localhost]43 (750/dovecot)
*:*:*:*::*:80 (1656/apache2)
*:*:*:*::*:465 (1182/master)
*:*:*:*::*:21 (1220/pure-ftpd)
*:*:*:*::*:53 (649/named)
*:*:*:*::*:22 (657/sshd)
*:*:*:*::*:25 (1182/master)
*:*:*:*::*:953 (649/named)