Siebel Services not starting Gateway name not defined ErrCode 4597527

Issue:
When starting Siebel services receiving error:

Windows could not start the Siebel Server [SERVER_NAME] on Local Computer. For more information, review the System Event Log. If this is non-Microsoft service, contact the service vendor, and refer to service-specific error code 2555922.

Analysis:
From Siebel Server Logs (UAT_ENT.STG-APP.log) found below error:
1. NSS - ErrCode 4597527  SysErr 0
2. SBL-SMI-00053: Internal: The Siebel Gateway name was not specified (smilobj)

From Gateway Server Logs (NameSrvr.log) found below errors:

DBCLog    DBCLogError    1    0000000262001088:0    2022-02-07 12:28:54    [Microsoft][SQL Server Native Client 11.0][SQL Server]Login failed for user 'SADMIN'.

GenericLog    GenericError    1    0000000262001088:0    2022-02-07 12:28:54    (secmgr.cpp (2768) err=4597538 sys=127) SBL-SEC-10018: [Microsoft][SQL Server Native Client 11.0][SQL Server]Login failed for user 'SADMIN'.

GenericLog    GenericError    1    0000000262001088:0    2022-02-07 12:28:54    (secmgr.cpp (2824) err=4597527 sys=0) SBL-SEC-10007: The username or password you have entered is not correct. Enter your username and password again.

Solution:
Reset the SADMIN password from SQL Server (should be same as when configured the Siebel).
Stop the Gateway and start again.
Start the Siebel Services.
Wait for few minutes and open the Siebel Application.