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I've had this problem with other technologies, not Growthbook. In my experience, the easiest option is to get their IT group to add the host (growthbook.io) as an allowed connection. It's probably worth pushing for. HTH.

Agree with @mammoth-actor-96938 that adding GB as an allowed connection is the easiest solution. Otherwise, proxying is another possibility: https://docs.growthbook.io/self-host/proxy#best-practices