SUIM comparision ECC to 4.7

Hi All ,

I wanted to do compare some roles and user from ECC 6.0 to 4.7 R/3 . I did set up a RFC(ECC6.0 to 4.7 ) to use it for comparision . The RFC is working perfectly fine , But when i use the comparision program it gives me the error 'System can not be reached'

However when i do the same task from 4.7 to 6.0 i am getting the comparision result but i am not able to dig into the field values .

Can you guys please help on this .