Logon issue in Production environment (WebDynpro)

Hi people.

I have an issue i cant solve.

I have made a webdynpro and succesfully transported to PRODUCTION,

My problem is that the application logon appears everytime i put a valid user.

( In Development and QAS Environment works perfectly, in logon i put a valid user and the aplication appears)

What could be the problem ??

Thanks