can't set sap bw connection .

Hi Pro,

    I am trying to design a dashboard on sap bex quer, using 'SAP netweaver BW connection',  after I input credential in the pop-up windows, I got a message windows as follows:

           ' sap GUI connection are started via connection string. /H/10.86.80.38/S/3200

            Attention: system information could not be verified

            do you want to log on to this system?

then I click 'Yes',  a error message immediately pop out, there is only a red-cross in it without any text information. after click 'OK' again, it get out . since then, if I want try to set up connection again, the query browser botton does not work anymore.

could you please tell me how to resolve it?