SOAP client against an HTTPS server with an unknown certificate

Hello,

I'm trying to use SOAP.connect() on a webservice using HTTPS on an Adobe Acrobat Pro DC.

But SOAP.connect() returns "undefined".

If I try to connect to another service through HTTP, SOAP.connect() returns a proxy object I can use to query the server.

The server uses a certificate from CatCert (regional government's certification agency) that is not trusted by major browsers, so I guess it is not trusted too by Acrobat.

Could this be the source of my problem?

If so, can I add the server's certificate chain to Acrobat so I can call the SOAP service?

Thank-you very much in advance