Dear Experts,
I am in a mess now and need your help.
When I am trying to create a source system in RSA1 after refresh of the BW system. Now, when I try to create the source systems after providing all the passwords and RFCs in the last step I get the following error:
Error in source system SCQCLNT001
Message no. RSAR502
Diagnosis
With Remote Function Call to system SCQCLNT001 error ccurred.
Procedure
Remove the cause of the error.
I have searched the SCN and read so many threads but to no avail. Most important of them are:
- The SCC4 and SE06 settings are "OPEN" as per recommendations in both the systems. (tried)
- The remote user has been specified in global settings of RSA1. (Done)
- The RFCs are working fine to and fro.
Kindly advise on this weird issue. 
Thanks,
Avishek