Symptom
In transaction code SM21, you found error, SSF_KRN_SIGN_BY_AS: Function Returned 5 keeps generating.
Solution
1. Execute transaction code SM21 and double click on the error. You will find the return code error number explanation. For our case, the return code is number 5 SSF API: Signer error.
Error number:
1 SSF API: No security product found
2 SSF API: Invalid security format
3 SSF API: No input data found
4 SSF API: Insufficient main memory
5 SSF API: Signer error
6 SSF API: No memory for results list
7 SSF API: Unknown address book
8 SSF API: Invalid address book password
9 SSF API: Recipient error
10 SSF API: Invalid hash algorithm
11 SSF API: Encoding of data failed
12 SSF API: Decoding of data failed
13 SSF API: Unknown error in security product
14 SSF API: Unknown error
15 SSF API: No security product license key
15 SSF API: Security product does not support encryption
2. Next, run the transaction code STRUST / STRUSTSSO2. Most probably the root cause is due incorrect certificate owner under the System PSE (The CN = xxx is wrong). To get rid of this error, right click on the System PSE and choose Replace.
3. Select Yes.
4. Accept the default value. Ensure the Name is correct and pointing to the the SID system. The error will no longer generating.
