2623562 - PREP_PREPROC/HDB_HDI_CHECK failed during S4/HANA conversion

You are doing S/4 HANA conversion, but encounter error at the PREP_PREPROC/HDB_HDI_CHECK phase.

Error during execution of SQL command: ALTER DATABASE HDB ADD 'diserver' SAP DBTech JDBC: [2]: general error: Database could not be started;start databaseServer for database=3 on :<hostname>:3<IN>25 failed.

From the HDB_HDI_CHECK.LOG, you could see the following error :

Closing connection: jdbc:sap://<hostname>:3<IN>13?databaseName=SYSTEMDB Connect user: System

Error during execution of HdbCmdClazz section!
Error during execution of SQL command: ALTER DATABASE HDB ADD 'diserver' SAP DBTech JDBC: [2]: general error: Database could not be started;start databaseServer for database=3 on : <hostname>:3<IN>25 failed
Error during execution of SQL command: ALTER DATABASE HDB ADD 'diserver' SAP DBTech JDBC: [2]: general error: Database could not be started;start databaseServer for database=3 on : <hostname>:3<IN>25 failed

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SAP HANA, platform edition

SAP HANA network, niping, communication connection refused, host, port, IP address, internal network, DMO, S/4 HANA, Migration, Upgrade, Installation, DI server , KBA , HAN-LM-INS-SAP , Installation of SAP Systems on HANA , Problem