Configuring ODBC - error

I'm trying to set up ODBC on linux. I've performed all the steps in the admin reference document. Create the odbc.ini file, etc.

When I try to use an odbc connection in PLP I get the following error 'SOAP Faultcode: SOAP-ENV:Server. Error code: 404'

Then the datasource window opens with nothing inside. Does anyone know what I'm doing wrong?

thanks,
simon.