Error connecting to a database via Toad for Oracle:
"The procedure entry point WSAEventSelect could not be located in the dynamic link library orauts.dll"
Running tnpsing also generates the same error message.
Multiple Oracle Home clients installed and conflict between RDBMS and Oracle Warehouse installation (Oracle DocID: 306273.1).
WORKAROUND 1:
Remove the ORACLE_HOME system variable from the machine's environment variables and restart Toad.
WORKAROUND 2:
If removing ORACLE_HOME from the environment variables is not permitted, then Toad must be run in a batch in order to nullify the ORACLE_HOME variable. The BAT file should contain the following:
set ORACLE_HOME=
"C:\Program Files\Quest Software\Toad for Oracle 10.6\Toad.exe"
WORKAROUND 3:
If ORACLE_HOME system variable does not exist, then create a new ORACLE_HOME with an arbitrary path. Next, edit the variable to nullify the path value.
To access System Variables select Start | Control Panel | System | Advanced Tab | Environmental Variables | System Variable list
