Unable to register ssl in trust center services

Hi Gurus,

We are trying to enable ssl in our SAP web dispatcher through SAP trust center services.

As we know that sap offers free signing of certificates for 8 weeks validity . we are trying to accomplish this by importing our CA Request in the below .

But we are getting a message that CA signing will not be done for Internal systems . Our motive is to publish this web dispatcher to the internet and we are confused on the prerequisites before going for SAP CA signing service.

If anyone can shed light over the below error will be helpful

Regards,

Suratharajan .S