[System error: Socket closed] for HANA server

Hello,colleagues

When I restart HANA db, during the startup process,I found the memory is not enough, so I closed other system in this server to save memory and

restart the HANA db, but it returned with error messages as follow and no diagnosis files displayed:

Connection to database server lost; check server and network status [System error: Socket closed] (com.sap.db.jdbc.exceptions.jdbc40.SQLNonTransientConnectionException: Connection to database server lost; check server and network status [System error: Socket closed])

I'm not sure whether  note 1836774 ( SAP HANA Database: Database connection is hanging) is related to this issue.Because SQL console could not be used and I could not find the connection_id of this HANA server.

Do you know how to resolve this issue?

Thanks a lot in advance!

Best regards,

Daniel