SYMPTOM
The following error occurs in two-tier mode when users try to execute a report or try browsing attribute elements in Strategy Developer 9.4.1 and 10.x (the same error is reported in DSSError log file):

QueryEngine encountered error: Call SQLDriverConnect got SQL_ERROR ORA-2800: the account is locked Driver's SQLSetConnectAttr failed.
ACTION
Verify that the database login name used is correct. For more information on the error, review following documents: