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Ivaylo BalabanovIvaylo Balabanov 

About Lightning Connect

Hello,

Is it possible data source to be in our premices not expose the data in Internet?

Regards,
Ivo
pconpcon
Currently you have no choice but to make it available to the internet since Salesforce is not hosted within your environment.  There are things you can do to lock it down including whitelisting Salesforce's IP address and adding authentication.