Installed Virtualmin, apache configuration errors

[Ano]

SYSTEM INFORMATION
OS type and version	Debian 12
Virtualmin version	7.40.0

I’ve installed Debian 12 on a fresh VPS.
I’ve run the installation command and it was succesful. I’ve installed version Virtualmin Virtual Servers Version 7.40.0

When I log in and complete the wizard, it shows:

**Warning!** The Apache configuration on your system has errors! This will prevent any new domains from being fully added by Virtualmin until the errors are fixed.

AH00526: Syntax error on line 3 of /etc/apache2/ports.conf: Cannot define multiple Listeners on the same IP:port Action 'configtest' failed. The Apache error log may have more information.

When I check the ports.conf it shows:

Listen 80
Listen 443
Listen 80
Listen <my ip>:443
Listen 80
Listen <my ip>8:443
Listen [<my ip v6>]:443

Any idea why this happens?

After some more googling I found this user with the same issue: Apache error: AH00526: Cannot define multiple Listeners on the same IP:port

Also, when checking the installation logs:

[2025/09/12 11:29:01] [INFO] - Configuring Virtualmin
[2025/09/12 11:30:19] [INFO] - Code: 0 Result: 
[2025/09/12 11:30:19] [INFO] - Succeeded
[2025-09-12 11:30:20 UTC] [DEBUG] SSL certificate request for the hostname : 0 : Failed to set up SSL certificate for the <my hostname> hostname
[2025-09-12 11:30:20 UTC] [DEBUG] Cleaning up temporary files in /tmp/.virtualmin-18803.
[2025-09-12 11:30:20 UTC] [DEBUG] Primary address detected as <my ip>
[2025-09-12 11:30:20 UTC] [SUCCESS] Installation Complete!

[jimr1]

see this looks like the same problem

Issue fresh install on ubuntu 24.04

Hi, i’ve installed a new vps with ubuntu 24.04 and after the wizard on virtualmin, i’ve this error: AH00526: Syntax error on line 3 of /etc/apache2/ports.conf: Cannot define multiple Listeners on the same IP:port and inside the file i’ve these lines: Listen 80 Listen 443 Listen 80 Listen 62.169.x.x:443 Listen 80 Listen 62.169.x.x:443 Listen [2a02:c207:2280:x::1]:443 How can i fix ? I don’t why there’re the same port in differents lines. Thanks SYSTEM INFORMATION OS type a…

look near the bottom of the thread for a work around

[Ano]

Thank you, that seems to work. I’ve removed the double lines from ports.conf (not sure if that’s necesarry and
I’ve removed the file
0-.conf from /etc/apache2/sites-available and /etc/apache2/sites-enabled and now the error is gone.

[jimr1]

@Ano

I’ve removed the double lines from ports.conf (not sure if that’s necesarry

for anyone reading this, you do need to remove the duplicate port entries.
glad you fixed it

[Ilia]

@Ano

Thank you, that seems to work. I’ve removed the double lines from ports.conf (not sure if that’s necesarry and
I’ve removed the file
0-.conf from /etc/apache2/sites-available and /etc/apache2/sites-enabled and now the error is gone.

Both of these issues, like the incorrect port declaration in ports.conf and the Apache site config not clearing after an SSL request for the hostname during the initial installation, are related to a bug in the current Virtualmin Config v7.0.21.

Apache error: AH00526: Cannot define multiple Listeners on the same IP:port

@Jamie, okay, I remembered we’ve had this issue before. And, it was due to a bug in Virtualmin Config where Apache config files were edited incorrectly outside of the Apache Webmin module, causing cache corruption. To fix this, @Joe needs to release an updated version of the Virtualmin Config package that is still compatible with Virtualmin 7 repos.