RFC destination -- logon screen problem

Hi ,

I have a list of RFC destinations. I call a same function module using all these RFC destinations. <b>My problem is it shows me logon screen for some of the destination</b>.

I have authorizations for all the destinations.

Also my User id is configured in all the destinations.

I want to avoid this screen when the rfc destination is called ..... can anyone help me in this

Thanks in advance.