Which operating systems can be used to host the Access Server software?
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Currently, the Access Server software must be run on a Linux host. The software is released in the form of binary package files for particular Linux distributions.
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RPM packages can be ran on both 32-bit and 64-bit of the following systems:<br><br>

    * CentOS 4<br>
    * CentOS 5<br>
    * Fedora 9<br>
    * Fedora 10<br>
    * RHEL 4<br>
    * RHEL 5<br><br>

The Deb Packages can be ran on both 32-bit and 64-bit of the following systems:
<br><br>
    * Ubuntu 8<br>
    * Ubuntu 9<br>
    * Ubuntu 10*<br>
    * Debian 4**<br>
    * Debian 5*<br>
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http://openvpn.net/index.php/download/access-server-downloads.html