Error creating source systems

Hi,

We have R/3 4.6C and BI7.0 in our landscape.

When i tried to create source system in BI to R.3 4.6C, its not able to create.

It giving error "RFC user logon failed". But all the RFC users password is correct and i have tested it.

I have created successfully with the same RFC user between BI and SRM.

Can anyone tell me what the problem could be and guide be in this regard.

Thanks and Regards,

Sailesh K