2819272 - Error in SUM phase PREP_PREPROC/HDB_HDI_CHECK

During the upgrade of S/4HANA system, you meet error at phase

Severe error(s) occurred in phase PREP_PREPROC/HDB_HDI_CHECK!

Last error code set:
Unexpected result ''
Trouble Ticket Generation

 Checking SAPup_troubleticket.elg, you may find below error information:

3 ETQ121 <timestamp>: PID xxxxx execute '~/../jvm/jre/bin/java -cp ~/bin/com.sap.hdb.sl.lib.jar:~/bin/com.sap.hdb.core.jar com.sap.hdb.core.main.cmd.HdbCmdMain HDB_CMD_CLAZZ_NAME=IS_MULTI_DB DATABASE_SID=<SID> DATABASE_HOSTNAME=<hostname> INSTANCE_NUMBER=00 JDBC_PATH=~/bin READ_FROM_STDIN=TRUE ENCRYPT=true' in background, output written to '/global/<hostname>/apps/SUM/abap/log/HDB_HDI_CHECK.LOG'.
3WETQ122 <timestamp>: PID xxxxx exited with status 1 '' (time: 1.0/ 1.4/ 0.2/385MB real/usr/sys/maxmem)
4 ETQ399 <timestamp>: WAITED for 1 processes to finish, 0 aborted.
4 ETQ399 Result of command line call: ''
1EETQ399 Last error code set is: Unexpected result ''
1EETQ204 Upgrade phase "HDB_HDI_CHECK" aborted with severe errors ("<yyyymmddhhmmss>")

 Then we can see below information in HDB_HDI_CHECK.LOG.

EXECUTING /global/<hostname>/apps/SUM/abap/../jvm/jre/bin/java -cp /global/<hostname>/apps/SUM/abap/bin/com.sap.hdb.sl.lib.jar:/global/<hostname>/apps/SUM/abap/bin/com.sap.hdb.core.jar com.sap.hdb.core.main.cmd.HdbCmdMain HDB_CMD_CLAZZ_NAME=IS_MULTI_DB DATABASE_SID=RPP DATABASE_HOSTNAME=<hostname> INSTANCE_NUMBER=00 JDBC_PATH=/global/<hostname>/apps/SUM/abap/bin READ_FROM_STDIN=TRUE ENCRYPT=true

<timestamp> | com.sap.hdb.sl.lib.connection.sql.JdbcConnection | Start new connection with connect URL: jdbc:sap://<hostname>:30013 connect user: _SYS_DUMMY_

<timestamp> | com.sap.hdb.sl.lib.connection.sql.JdbcConnection | Last user: _SYS_DUMMY_, New user: System

<timestamp> | com.sap.hdb.sl.lib.connection.sql.JdbcConnection | Recieved connection refused at port 30013. Suppose that instance is a single-container system.

<timestamp> | com.sap.hdb.sl.lib.connection.sql.JdbcConnection | Start new connection with connect URL: jdbc:sap://<hostname>:30015 connect user: SYSTEM

<timestamp> | com.sap.hdb.sl.lib.user.password.HdbPassword | Error retrieving password policy from database: com.sap.hdb.sl.lib.exceptions.HdbException: com.sap.db.jdbc.exceptions.JDBCDriverException: SAP DBTech JDBC: Cannot connect to jdbc:sap://<hostname>:30015 [Cannot connect to host <hostname>:30015 [Connection reset], -813.].. Using default values.

<timestamp> | com.sap.hdb.core.main.cmd.HdbCmdMain | Name of HdbCmdClazz: class com.sap.hdb.sl.lib.utils.cmd.clazz.IsMultiDB

<timestamp> | com.sap.hdb.sl.lib.connection.sql.JdbcConnection | Instance is a single-container system.

<timestamp> | com.sap.hdb.sl.lib.connection.sql.JdbcConnection | Start new connection with connect URL: jdbc:sap://<hostname>:30015 connect user: SYSTEM

<timestamp> | com.sap.hdb.core.main.cmd.HdbCmdMain | Error during execution of HdbCmdClazz section!

<timestamp> | com.sap.hdb.core.main.cmd.HdbCmdMain | com.sap.hdb.sl.lib.exceptions.HdbException: com.sap.db.jdbc.exceptions.JDBCDriverException: SAP DBTech JDBC: Cannot connect to jdbc:sap://<hostname>:30015 [Cannot connect to host <hostname>:30015 [Connection reset], -813.].

 Furthermore, you get chance to check the DB traces, such as nameserver trace and indexserver trace. And find below error in the DB traces.

handshake error: SSL handshake failed: SSL error [536871700]: Unknown error, General error: 0x20000314 | SAPCRYPTOLIB | SSL_accept
SSL API error
Client authentication failed due to missing client certificate
0xa060024a | SSL | ssl3_accept
Client authentication failed due to missing client certificate.
0xa060024a | SSL | ssl3_get_client_certificate
Client authentication failed due to missing client certificate.
0xa060024a | SSL | ssl3_check_for_client_certificate
Client authentication failed due to missing client certificate.
0xa060024a | SSL | ssl3_decode_client_certificate
Client authentication failed due to missing client certificate.
(ErrCode: 536871700)

•  SAP S/4HANA
•  HANA Platform 1.0
•  HANA Platform 2.0

 PREP_PREPROC/HDB_HDI_CHECK; HDB_HDI_CHECK; upgrade; jvm/jre/bin/java; SSL handshake failed; sslEnforce; ErrCode: 536871700; missing client certificate; , KBA , HAN-LM-UPG-SAP , Upgrade of SAP Systems on HANA , HAN-DB-SEC , SAP HANA Security & User Management , Problem