I have installed NitroShare 0.3.1* on Ubuntu 18.10 and 0.3.4 on Windows 7. I can transfer files in either direction with UFW firewall off, but not with it on. I assumed that I needed to add some rules to UFW and tried this for the Transfer port

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and something similar for the broadcast port 40816. The result is this

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This works - but is it correct? I don't want to take any risks.

*The standard version 0.3.3 has a bug, it isn't related to security, it just stops the transfer.

  • If it works then what is or are your fear(s), and what bug? Dec 4 '18 at 21:28
  • 1
    when the firewall is up you could allow all incoming connections from the win 7 pc with sudo ufw allow from <win7 ip>
    – ptetteh227
    Dec 4 '18 at 21:56
  • @ptetteh227, That looks better than what I have on my Linux machine, as I think my rules would allow links from any other WiFi connection if I was in public. What would I replace <win7> with? Is it the IP address of the Windows machine, and if so how would I find it out? Dec 5 '18 at 11:00
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    its a bit secure but it assumes the windows machine always gets the same ip when connected to the router. replace <win7 ip> with the windows 7 ip address. you can find it from the Windows command prompt by typing ipconfig or following the tutorial here support.microsoft.com/en-ca/help/15291/…
    – ptetteh227
    Dec 5 '18 at 14:17

An ArchLinux page says:

Basic configuration

A very simplistic configuration which will deny all by default, allow any protocol from inside a LAN, and allow incoming Deluge and rate limited SSH traffic from anywhere:

ufw default deny

ufw allow from

ufw allow Deluge

ufw limit SSH

So I picked out

# ufw allow from

which I think should allow connections between computers within my LAN only. I'll now have to work out how to do this on the Windows computer.

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