2343639 - SUM Connect to database for shadow instance failed - rc = -10104 with UPGSHDKEY during upgrade of SAP system running on HANA Database

You are performing upgrade of a system running on HANA database. DB connect to shadow system fails with below error in log files:

4 EPU201XBEGIN OF SECTION BEING ANALYZED LASTOFFSET                 1278 NOW BEGIN OF SCEXEC_ALIAS =============
1 ETQ000 ==================================================
1 ETQ399 Executing SQL script '../var/PTALDC12.XQL'.
2 ETQ399 Connecting to database 'HDB'.
3EETQ008 Error message: DBSL error 99 (db code -10709): Connect failed
4EETQ399 1 [dbhdbsql.c,  293]:

Try to connect via secure store (UPGSHDKEY) on connection 0 ...
4EETQ399 1 [dbhdbsql.c,  306]: invalid secure store entry, rc = -10104 (Invalid value for KEY (UPGSHDKEY))
4EETQ399 1 [dbhdbsql.c,  325]:
Try to connect via environment (localhost:7878) on connection 0 ...
4EETQ399 0 [dbhdbsql.c,  355]: Connect to database failed, rc=1, rcSQL=-10709 (Connection failed (RTE:[89006] System call 'connect' failed, rc=111:Connection refused))

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1. Software update manager 1.0

2. HANA Database

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DBSL error 99, db code -10709, rc = -10104, rc=1, rcSQL=-10709, SCEXEC_ALIAS, UPGSHDKEY, hdbuserstore, hdbuserstore -H, SSFS , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , HAN-DB , SAP HANA Database , Problem