Apache restrict access with certificates

Hello!

Does anyone know if it's possible to restrict access to apache webserver with certificates?

What I want is that if a user has a certificate in his browser then he get's access, if not show error or another page.

I would be very happy if someone knew!
/D

This may help Apache 2 with SSL/TLS: Step-by-Step, Part 1

Basically you would just provide https access.

I got it to work earlier today, it's awesome.
Really great way to do easy middle secure authentication!

Thanks for the reply!