The Developer tool must use a certificate to import WSDL data objects and schema objects from a URL that requires client authentication.
By default, the Developer tool imports objects from URLs that require client authentication when the server that hosts the URL uses a trusted certificate. When the server that hosts the URL uses an untrusted certificate, add the untrusted certificate to the Developer tool. If you do not add the untrusted certificate to the Developer tool, the Developer tool cannot import the object. Request the certificate file and password from the server administrator for the URL that you want import objects from.
The certificates that you add to the Developer tool apply to imports that you perform on the Developer tool machine. The Developer tool does not store certificates in the Model repository.