IPSEC and Windows 2003 Certificate authority

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We have got Itanium box running HPUX 11.23 and we want that any Windows user who connects to our HP Server to communicate t via IPSEC and IPSEC to obtain certificate from a Windows 2003 CA.

this project is necessary to meet an external audit requirement that all passwords are encrypted when transmitted over the network

Can you please let me know how I can configure IPSEC on HPUX Server to obtain certificate from windows certificate authority

To test I was able to secure FTP session between windows PC and HPUX Server using pre-shared keys.
But the HPUX IP SEC Admin Guide does not give much information on how to obtain certificates from the CA

[Aggy]

I have not found the solution yet