[informix] onpladm returns SQL ERROR -668 on windows -- Posted by inturi on Friday, May 2 2008
Make sure you do the below step:

Running the Run Job or Run Project Commands
To execute the run job or run project commands with the onpladm utility, enter a user name and password in the Host Information tab of the SETNET32 utility of the IBM Informix Client Software Developer's Kit. For more information on the SETNET32 utility, see the IBM Informix: Client Products Installation Guide.

If you do not enter the username and user password, you receive the following error:

Cannot execute stored procedure start_onpload SQL ERROR -668

If you receive this error, the online log file contains the following message:

System() command "$INFORMIXDIR/bin/onpload -H hostname -S
servername -rl -fb" in SPL routine cannot be executed because user
"username" did not connect with a password.

To execute other commands with the onpladm utility, you do not have to enter a user name and password.