In order to accept the digital certificates as trustworthy by the ADSS Signing Server, you need to register the CAs within the Trust Manager module that will be considered as trusted. This module can also be used to register other types of Trust Authorities (TAs) namely self-signed OCSP responders, CRL issuers and self-signed TSAs.

See also

Step 1 - Generating Keys and Certificates
Step 3 - Configuring CRL Monitor
Step 4 - Configuring Signing Profile
Step 5 - Registering Business Applications
Step 6 - Using the Service Manager