Question : How do I disable launch reference requests in a Citrix Farm?

I have a Citrix web interface management console running on Server 2008 R2, I am connecting to a Citrix server 4.0 running Server 2003.  I have the site in IIS 7 created and when I connect to the site I get a login prompt and can login and see my published apps, but when I try to start these apps I get this error "An error occured while making the requested connection"
When I check the event logs I see this error ...

The farm has been configured to use launch references, but a launch reference was not received from the Citrix XML service. Check that the farm supports launch references or disable launch reference requests.

Citrix XML is installed and running...I cannot find any information on launch references in the Citrix forums.....

Any help would be greatly appreciated!!!!

Answer : How do I disable launch reference requests in a Citrix Farm?

Thanks for the suggestions, but I found the solution.  It had to do with the fact that the Citrix server I am using is 4.0 and that does not gel with ZenApp...so the fix is to ensure that theRequireLaunchReference parameter is set to Off and that OverrideIcaClientname is set to On in the XenApp Web site configuration file that is in the inetpub\Citrix folder, the file is called WebInterface.conf.

Thanks again, maybe this posting will help someone else.