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I often use my Android as a hotspot.

I would like to block port 25 for all devices using my hotspot.

Is this possible with Android?

  • For this testing I just used a WiFi router that was lying around in the office and blocked traffic via port 25. I would still be interested in finding a solution independent of PC / office network, encase I need to replicate testing environment out of the office. – Luke Sep 4 '17 at 22:40
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Your best option is to use NMAP through your computer. Make a hotspot, connect your PC to it, use NMAP and ipconfig. Not sure if that works, but there isn't any other alternative as far as I know. In theory, there are some firewall apps, but those rarely work as intended, and you are much better configuring your Android ports through PC.

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