error occured during the "test of the interface"

Hi,everybody

where I do the "Test Configuration" in the ID(Tools->Test Configuration),an error occured.

Internal Error

HTTP connection to ABAP Runtime failed.

Error:403ForbiddenURL:http://NEUESDNWXI01:8001/sap/xi/simulation?sap-client=500

User: PIDIRUSER

what can i do with the error?

Thanks