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Continue to ChatApplication Whitelists and Blacklists - you need to know https://whilenetworking.com/2018/07/31/application-whitelists-and-blacklists-you-need-to-know/
Application Whitelists and Blacklists - you need to know https://whilenetworking.com/2018/07/31/application-whitelists-and-blacklists-you-need-to-know/