3134882 - Error in SUM phase PREP_EXTRACT/SUMASK : DDIC password does not work

During an upgrade using Software Upgrade Manager (SUM), an error is observed in phase " PREP_EXTRACT/SUMASK".

Error in SUMASK.LOG:

ERROR: DDIC password does not work:
RFC login to system <SID> ashost <Hostname> nr <Instance No.> gwhost <Hostname> gwservice sapgw01 failed with code 1 key RFC_COMMUNICATION_FAILURE: 
LOCATION    CPIC (TCP/IP) on local host with Unicode
ERROR       partner 'Hostname:33xx' not reached
TIME        Tue Nov 23 23:50:52 2021
RELEASE     753
COMPONENT   NI (network interface)
VERSION     40
RC          -10
MODULE      /bas/753_REL/src/base/ni/nixxi.cpp
LINE        3454
DETAIL      NiPConnect2: 192.168.80.17:3301
SYSTEM CALL connect
ERRNO       111
ERRNO TEXT  Connection refused
COUNTER     15
.
Password for user "SYSTEM" is invalid:
The hdbsql connection is not possible due to the following error message: * 10: authentication failed SQLSTATE: 28000

Note: Verified that DDIC password is correct & Gateway is up and running.

• Software Update Manager (SUM)
• SAP Netweaver AS ABAP

PREP_EXTRACT/SUMASK, DDIC password does not work, SUMASK, RFC login, failed, RFC_COMMUNICATION_FAILURE, NI (network interface), Connection refused, Password for user "SYSTEM" is invalid, SYSTEM, DDIC, * 10: authentication failed SQLSTATE: 28000, SQLSTATE: 28000, Software Update Manager, SUM, password, hdbsql , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem