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Firewall

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" Firewall will only allow external hosts to send packets on existing open TCP connections or connections that are being opened (by internal hosts) but not allow them to open TCP connections to hosts in the private network"

What problem will arise, if it open TCP connections to hosts in the private network ?

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As we know firewalls are used for security concern .It prevents from data leakage.So i think because of maintaining the security of data it will not allow to open TCP connection to hosts in the private network.
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