Weak Key in 3DES and MAC

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Hi,

I am developping a gateway for transforming encrypted ISO Messages to
decryptet HTML requests. In the testsystem only weak keys are used for the
encrypting of the ISO Messages. But I am not able of configuring my .NET
Framework or my application that way that it accepts weak keys and no to
throw an cryptografic exeption. Can anybody of you tell me if os is possible
to use those keys and how to manage this?

Thanks