2961140 - SQLERRTEXT : general error: database 'SID' not connected

• SAP System is not able to connect to the SAP HANA Database due to error: rc=1, rcSQL=2
  
  
• In the dev_w* trace, you find these messages:

C *** ERROR => Connect to database failed, rc=1, rcSQL=2
[dbhdbsql.cpp 420]
C SQLCODE : 2
C SQLERRTEXT : general error: database 'SID' not connected
B ***LOG BY2=> sql error 2 performing CON
B ***LOG BY0=> general error: database 'SID' not connected
B ***LOG BY2=> sql error 2 performing CON
B ***LOG BY0=> general error: database 'SID' not connected
M ***LOG R19=> ThDbConnect, db_connect ()
M in_ThErrHandle: 1
M *** ERROR => ThInit: db_connect (step TH_INIT, thRc ERROR-DB-CONNECT_ERROR, action STOP_WP, level 1)

• In the trans.log, you find these messages

4 ETW000 [dbhdbsql.cpp,00000] *** ERROR => Connect to database failed, rc=1, rcSQL=2
4 ETW000 [ dev trc,00000] SQLCODE : 2
4 ETW000 [ dev trc,00000] SQLERRTEXT : general error: database 'SID' not connected
4 ETW000 [ dblink ,00000] ***LOG BY2=>sql error 2 performing CON
4 ETW000 [ dblink ,00000] ***LOG BY0=>general error: database 'SID' not connected
2EETW169 no connect possible: "DBMS = HDB --- SERVER = '' PORT = ''"

• SAP HANA, platform edition
• SAP NetWeaver

hdbuserstore, application, server, host, port, tenant, tenantdb, secure, user, store,  default, abap, Connect to database failed, rc=1, rcSQL=2, general error , KBA , HAN-DB-SEC , SAP HANA Security & User Management , HAN-DB-CLI , SAP HANA Clients (JDBC, ODBC) , Problem