Hi,
is the FF-user valid (user Validation date on tab "Logon"? Is the user locked.
Another thing could be the customzing.The role SAP_SPM_FFIDmust be maintained (SPRO -> GRC -> AccessControl-> Maintain Configuration Settings-> Emergency User Access 4010
or the rfc-user or pw is not the same in grc and the target System.
Otherwise the Basis must check the plug-in.
BR
Melanie