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Why is it not possible to send a UDP Broadcast in some computers?

I've tested with Packet Sender, and it works in some computers in my company, and in others it is not possible to send.

There is another software from VIRDI company, called TerminalFinder, which sends UDP broadcasts at port 9870, but the same problem occurs.

I want to know if it is necessary to configure something in the network properties of the computers (Win 7 or Win 10) to make this work.

Remy Lebeau
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Bruno Yuzo
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    Is the UDP broadcast being sent to the generic `255.255.255.255` broadcast address, or a subnet-specific broadcast address, like `192.168.0.255`? Are the affected computers behind a firewall? Or on another subnet? Some firewalls may block UDP broadcasts to the generic address but allow broadcasts to a specific subnet. Some routers may block UDP broadcasts from span across subnet boundaries. Or, they might be blocking UDP broadcasts altogether. Check your network configurations. – Remy Lebeau Jul 28 '16 at 19:13
  • The Broadcast is being sent to 255.255.255.255. So, you think it can be the firewall, and not the configuration of the PC. I will do more tests. – Bruno Yuzo Jul 28 '16 at 20:00
  • I am only speculating, since you have not provided any details about your PC or network setup. It is *possible* that a firewall *might* be blocking it. That is one of many possibilities. In any case, unless you are writing your own broadcasting code, this line of questioning is off-topic for StackOverflow. Questions about general software should be directed to [SuperUser](http://superuser.com). Questions about network administration should be directed to [ServerFault](http://serverfault.com). – Remy Lebeau Jul 28 '16 at 21:06

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