# Processing Network Library does not work over 2 computers

**URL:** <https://discourse.processing.org/t/processing-network-library-does-not-work-over-2-computers/23687>\
**Category:** Libraries\
**Created:** [September 5, 2020, 2:29am UTC](https://discourse.processing.org/t/processing-network-library-does-not-work-over-2-computers/23687 "2020-09-05T02:29:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![TechMaster04](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/techmaster04/32/14929_2.png) [@TechMaster04](https://discourse.processing.org/u/TechMaster04)\
**Post date:** [September 5, 2020, 2:29am UTC](https://discourse.processing.org/t/processing-network-library-does-not-work-over-2-computers/23687/1 "2020-09-05T02:29:41Z")

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Hello

I was messing around with the Processing Network Library examples earlier today and noticed that they dont seem to work on 2 different computers (Connected to the same network). They only work if I run both examples on one machine. I then tried to use the UDP server library in the Contributions manager, leading to the same result. (Yes I was using a multicast UDP socket and IP)

I read online somewhere that it could be an issue with Port forwarding on my router, however I am unsure as to what to port-forward.

Any help troubleshooting this issue would be greatly appreciated

Regards

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**Author:** ![glv](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/glv/32/18785_2.png) [@glv](https://discourse.processing.org/u/glv)\
**Post date:** [September 5, 2020, 2:32am UTC](https://discourse.processing.org/t/processing-network-library-does-not-work-over-2-computers/23687/2 "2020-09-05T02:32:30Z")

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A related topic:

> [@Sending a Processing array from one computer to other computers](https://discourse.processing.org/t/sending-a-processing-array-from-one-computer-to-other-computers/20366):
>
> Hello, I’m creating a project that involves robots that are tracked with computer vision. The robots will each run on a Raspberry Pi Zero W. There will be about 20 of them. A camera mounted to the ceiling detects where the robots are in the space. That information is parsed by a Processing program on a computer connected to the camera. We’ll call that computer the master computer. What I would like to do is send an array of coordinates wirelessly from the master computer to the robots. I think…

`:)`

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<div class="post-metadata">

**Author:** ![TechMaster04](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/techmaster04/32/14929_2.png) [@TechMaster04](https://discourse.processing.org/u/TechMaster04)\
**Post date:** [September 5, 2020, 2:36am UTC](https://discourse.processing.org/t/processing-network-library-does-not-work-over-2-computers/23687/3 "2020-09-05T02:36:36Z")

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That was the one I was looking at last actually. Tried that, leading to no avail sadly