How can I validate a signature using OCSP?

I need to manage signed PDF documents. It was very easy to create a java prog to create and sign a PDF document (using itext).
I use the certificate from my Belgium Identity card for signature. Fine.
My problem is when reading the sign document.
On most PC, I see the signature with a yellow question mark (identity of the signer is unknown) which is not fine.
On some PC, when the signed document is opened, I see a real time connection to "http://ocsp.eid.belgiulm.be" and the signature appears with a green check which is very fine. That what I want.
What 'and how) are the required configuration to force this OCSP check?
I am using Adobe Reader 9 (v 9.4.1)
Thanks

The validation is currently done on both PC. That not the problem.
But on the first one, the validation fails because the "Identity of the signer is unknown"
On my second PC, the validation is done using OCSP (I see a realtime connection to "ocsp.eid.belgium.be") resulting in a successfull validation.
I would like TO FORCE OCSP VALIDATION on both PC. But I have no idea on how to force this OCSP validation. By chance, it happens on the first PC but I do not know why?

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