I've created a user with a Customer Portal Manager license.  I'm using that person's credentials to log into Salesforce using the EnterpriseConnection.  

I can use connection.query(soql) to query standard objects.

But if I try to query a custom object, I get an INVALID_TYPE error.

Is there anything special that needs to be done?

I am getting a user to use their customer portal manager credentials to log into an application we are building, but when the API call goes out, it says that a SECURITY_TOKEN is required.  I have added the IP to the trusted IPs but still the same error.  So, is there a way to get a security token for a Customer Portal Manager user?