One machine requesting thousands of RDS CAL's

Hi All,

We have an issue with RDS Licensing on a 2008 R2 server where a single client machine is requesting over 1000 RDS CAL's We cant find the machine, looks like it may not even exist anymore. But for some reason it still gets a new CAL every few minutes. Does anyone know how to prevent an RDS Licensing server from issuing CAL's to a specific machine?

Thanks.

Michael.