[Mailman-Users] Ubuntu/ISPConfig/Postfix/Mailman Installation Issues

[Ki Song]

I recently installed the following:
Ubuntu
Apache
ISPConfig
Postfix
Mailman

As far as I know, Ubuntu, Apache, ISPConfig, and Postfix are running ok. I
verified this by:
- ssh'ing into the ubuntu server
- logging into the ISPConfig pages on the server using a browser
- sending/receiving email through the Postfix server

I believe I installed mailman properly using this guide:
https://help.ubuntu.com/community/Mailman

However, when I try to log into my installation of mailman using a browser:
http://www.myhostname.com/cgi-bin/mailman/admin, there is a 404 error.

The only error message I see that may be relevant is:
NameVirtualHost myipaddress has no VirtualHosts mailman

What should I do?