Hi Albert,
You have to enter details of you solution manager host name, ABAP stack admin user ID and details as Dishant described.
I have faced same issue in solution manager 7.01 long back even though I maintained correct details in the configuration wizard. I just left the error and created RFC from ECC server to SOLMAN with type "G" (HTTP connection to External server). Once I created the RFC, ADS was working fine without any issues.
Please try the same and check the result by executing the report FP_TEST_00 in SE38 of your ECC system. kindly refer the link http://help.sap.com/saphelp_nw73ehp1/helpdata/en/4b/94e945ea576e82e10000000a421937/content.htm
Thanks and regards,
Pradeep