3683210 - SQL Error -10807 "Connection down" Despite Stable HANA Database - Client-Side Disconnect Due to Timeout and Outdated HANA Client

In an SAP S/4HANA 108 / SAP_BASIS 758 system, the following symptoms occur frequently (approximately ten times per month):

• SM21 logs: SQL error -10807 occurred; work process in reconnect status
• Batch jobs such as /UI5/APP_IDX_UPD_AFTER_IMPORT are cancelled
• End users experience short dumps
• AWS confirms no network packet drops; VPC Flow logs normal
• HANA traces show no crashes, resets or resource issues
• Network capture shows the ABAP work process initiating the disconnect:

1. 1. AP > DB: EXECUTEDIRECT (CURRENT_CONNECTION FROM DUMMY)
   2. DB > AP: SELECT (CURRENT_CONNECTION.CURRENT_CONNECTION)
   3. AP > DB: ACK
   4. AP > DB: ROLLBACK
   5. DB > AP: ROLLBACK
   6. AP > DB: FIN
   7. DB > AP: RST

SAP HANA DB Version 2.0

SQL error -10807, HANA client disconnect, rdisp/max_wprun_time, CONNECTTIMEOUT, SQLDBC connection drop , KBA , HAN-DB-CLI , SAP HANA Clients (JDBC, ODBC) , Problem