2551723 - SAP Single Sign-On - Execute Digital Signature error

• You have installed SAP Single Sign-On and are using the SPNego implementation of Secure Login Client with Kerberos token, where the application server SNC name is taken to check the keytab for the ticket verification.
• You have activated the BAdI implementation CL_SSFT_SYSTEM_SIGNATURE_NWSSO as provided in SAP Note 1862737 - BAdI SSFT_SYSTEM_SIGNATURE: New implementation for NWSSO, and when executing a digital signature the following error occurs:
  
  0x80004005: Unspecified error
  
  
  
• You are using Secure Store and Forward (SSF) interface on ABAP and when executing a digital signature the following error occurs:
  
  SSF error: unknown error
  

• SAP Single Sign-On 2.0
• SAP Single Sign-On 3.0

password, SAP GUI, CommonCryptoLib, SSF , KBA , BC-IAM-SSO-SL , Secure Login , BC-SEC-SSF , Secure Store and Forward , Problem