ActivationResponse.xml validity

Hi, I need to know if the ActivationResponse.xml (offline activation) has an expiration date. I have this problem: a customer needs a offline activation because he is using a Citrix server and the server has not an internet connection. Every time the Server boots he activates my application using the ActivationResponse.xml. Today the activation process failed. I don't understand why.

Thank you, Filippo Bottega.

I need to know if the ActivationResponse.xml (offline activation) has an expiration date.

Yes. It's the "expiration date" you type in.

Every time the Server boots he activates my application using the ActivationResponse.xml.

Why is he activating on every boot of the server? He doesn't need to do that.