How to block network traffic going to a specific remote port?

Question

Is there a way I could block a specific network port connection for a specific app in Android? My phone is rooted. I know iptables -I OUTPUT -p tcp --dport xx -j DROP but this blocks those ports for every app. I want to block it for a single app.


— Rozhyar Mohammed | Sources

Answer

You can block all TCP traffic from app with UID 10142, destined for port 53:



~# iptables -I OUTPUT -m owner --uid-owner 10142 -p tcp --dport 53 -j DROP


Change UID and port as per your needs.


— Irfan Latif | Sources

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