Export SSL certificate from Lotus Domino web server

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Hi all,
Just installed an IPS and trying to export SSL certificate (private/public key pair) from a Lotus Domino web server to 
import on the IPS to do SSL decryption. 

Tried the tool from IBM ikeyman to do the export, but did not work, got error message.

Need the keypair to enable us secure our web server

If anyone has been able to export certificate from Lotus Domino system, plz let us know

thanks all for ur help