3165765 - SGEN finished with System failure error: Name or password is incorrect in SUM Shadow

• SGEN is executed on the shadow system during an upgrade.
• Job RSUPG_SGEN_GENER8_LE is finished but shows the following message:

System failure: Task 000000001                                                      
Name or password is incorrect (repeat logon)                                        
System failure: Task 000000002                                                   
Name or password is incorrect (repeat logon)                                
System failure: Task 000000003                                                     
Name or password is incorrect (repeat logon) 

• DDIC password is confirmed to be working as per KBA 1904239 - SUM options to change parameters entered in INITPUT and INITSUBST phases
• dev_rfc* shows similar to the following:

ABAP Programm: RSUPG_SGEN_GENER8_LE (Transaction: )
Called function module: SUBST_UPG_SGEN_GENER8_RFC_LE
User: DDIC (Client: 000)
Destination: NONE (Handle: 1, DtConId: *, DtConCnt: 1, ConvId: *,{*})
EPP RootContextId: *, ConnectionId: 00000000000000000000000000000000, ConnectionCnt: 0
EPP TransactionId: *

SUM Upgrade

SGEN, Shadow, wp, logon, SUM, RSUPG_SGEN_GENER8_LE , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , BC-MID-RFC , RFC , Problem