Apache enumeration

[Uruz 7]

Hi,

I have a LAMP and email server setup to run a few sites and basically screw around with. I was doing some scans with nmap to check how secure it was and wasn't able to detect the version of Apache that I'm running which is what I set it up to do. I was wondering if there was another way I or someone else could find that information.

I'm pretty sure I'm safe anyhow considering I work for a web hosting company and every client I did a scan on spit out not only the version of Apache and OS/kernel information but it's version of PHP and Frontpage extensions as well but I just like learning new things. Any help/advice would be much appreciated.