# Problems receiving UDP messages

**URL:** https://discourse.nodered.org/t/problems-receiving-udp-messages/51067
**Category:** General
**Created:** [15 September 2021 16:11 UTC](https://discourse.nodered.org/t/problems-receiving-udp-messages/51067 "2021-09-15T16:11:08Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![arielperez](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@arielperez](https://discourse.nodered.org/u/arielperez)
#### Post date: [15 September 2021 16:11 UTC](https://discourse.nodered.org/t/problems-receiving-udp-messages/51067/1 "2021-09-15T16:11:08Z")

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Hi,

I'm trying to set up a general scenario which consists in a PC sending through UDP OUT node an UDP message to another PC receiving through UDP IN node that message.  
Node-red is installed over Windows OS in both cases.

Sended message:

 ![imagen](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/0/60c689949ced0bb9ec7025ab748f30cddcf3f39f.png)

(Not) received message:

 ![imagen](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/3/5/35b8261442b8dc2041fb99b1bdab1f384a1e88ba.png)

Please, note in the previous image that if I send a local UDP message, I recieve it without problems. But the message sended from outside network never arrives.

When I monitor the traffic using Wireshark, I see the incoming message, but it does not appear in the debbug windows of Node-red.

 ![imagen](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/f/a/fa7858835ff507f31918f25207761b32ef62fa5f.png)

Could anybody help me, please?  
Thanks in advance!  
Regards,  
Ariel

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### Author: ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [15 September 2021 16:28 UTC](https://discourse.nodered.org/t/problems-receiving-udp-messages/51067/2 "2021-09-15T16:28:26Z")

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do you have a firewall running ?

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### Author: ![arielperez](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@arielperez](https://discourse.nodered.org/u/arielperez)
#### Post date: [15 September 2021 17:51 UTC](https://discourse.nodered.org/t/problems-receiving-udp-messages/51067/3 "2021-09-15T17:51:56Z")

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Hi dceejay,

Despite I had set a rule in Windows Defender as the following image shows and it's active, it wasn't working.

 ![imagen](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/e/2/e26bd86c1f89e418c2a7fc4bbe98d89fce4e89db.png)

Only disabling Windows Defender service I could receive from outside.

![imagen](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/d/b/dbf550a475b5582fa14cc76c4b4e3955fc60d8f9.png)

I'm sorry but my OS is setting in spanish.  
I'll continue analyzing why that rule does not work but, at least, I could identify (from your help) the problem.

Thanks a lot!  
Regards,  
Ariel

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### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [14 November 2021 17:52 UTC](https://discourse.nodered.org/t/problems-receiving-udp-messages/51067/4 "2021-11-14T17:52:48Z")

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