Try the Materials Informatics Toolkit, which is designed to easily handle SMILES data. This and other helpful add-ins are available in the JMP® Marketplace
Interesting; the JSL works for me on that site. I think the message comes from your company's firewall. Does http://www.infoclimat.fr/ work from a browser, as http: not https:? I'm using JMP 13, what version are you using?