Re: Man in the middle for your security....
Zscaler is going to be just as vulnerable in its own way. Security through obscurity has always been a dangerous gambit. The main reason none of these solutions is open source is the same reason national security estimates are kept classified: their flaws would be undeniably obvious and make it impossible for anyone to sign off on them -- resulting in the death of yet another cash cow. Systems configured to use Zscaler or other proxies like it should never be trusted for any purpose. Period.
Biting the hand that feeds IT
