Remove Diffie-Hillman key exchange

Hi,

I am using universal server 3.20, and we are using WDE (no mail services). I have had a security review recently, and they are asking me to look into removing diffie-hillman key exchanges. We are using RSA key type for WDE, so this shouldn't be a problem. How do I do this though, and can you foresee any problems if I do this i.e. do any pgp services use diffie-hillman by default?

Thanks