Starting NetLogo behind Proxy

[Dapeng Dong]

Dear NetLogo Developers,

I'm wondering if there is a way to disable NetLogo's behavior of connecting to the Internet when starting up. Whenever I launch NetLogo on a remote server that is behind a proxy, it takes very long time to load. 

Thank you!

 

[Michael Tamillow]

Netlogo connects to the internet when starting up?

Since when??

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[Michael DeBellis]

I just disabled my network and started Netlogo and it worked fine. I also looked through the documentation: https://ccl.northwestern.edu/netlogo/docs/  for "Internet" and "url" and didn't find anything. The one thing I found when I searched for "network" that seemed relevant was: 

Environment:
Command center for on-the-fly interaction
Interface builder w/ buttons, sliders, switches, choosers, monitors, text boxes, notes, output area
Info tab for annotating your model with formatted text and images
HubNet: participatory simulations using networked devices

So it looks like there is a version called HubNet if you want to do models distributed across the Internet but I don't think the default version goes out to the Internet. Are you perhaps trying to access some version that was loaded on a server at your school or work? 

Michael

https://www.michaeldebellis.com/blog

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[Dapeng Dong]

Michael,

Thanks for pointing out the HubNet part.

I don't use HubNet. I just simply started the 'standard' NetLogo. I've tested it on my laptop. When I use my personal internet connection or just disable the network connections, NetLogo works fine, but when I connect my laptop to our internal network, it takes a very long time to load.

Dapeng

[Michael Tamillow]

It’s probably your internal network’s security.

Sent from my iPhone

On Aug 29, 2024, at 7:53 AM, Dapeng Dong <dapeng....@gmail.com> wrote:



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[Greg Skyles]

It might be that your 'institution' has some sort of EDR agent installed on your system that treats the netlogo program as something suspicious when you are on their network.

You could look at using the Sysinternal tools (I'm assuming you are on Windows) especially Process Explorer to find out what your system is actually doing (or not) while you are waiting for Netlogo to load up.

https://learn.microsoft.com/en-us/sysinternals/

Cheers, Greg

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Please note my email address has changed to gssk...@acm.org

[Aaron Andre Brandes]

Hi,

NetLogo makes a request over the network to update information about extensions and their latest versions.

I know of one other case where the user of a linux server had a similar issue.

 

One can turn off this request by setting the java preference netlogo.libraries.disabled=true 

 

One way to do this is to edit the NetLogo configuration file which for MacOS is "NetLogo 6.4.0.app/Contents/app/NetLogo 6.4.0.cfg"

 

You can locate the file on a Linux system by cd’ing to the NetLogo installation directory in a terminal and executing

find . -name "*.cfg"

 

Then add this line to the section with java-options (order doesn’t matter)

java-options=-Dnetlogo.libraries.disabled=true

 

Note that there is a separate file for NetLogo3D.

 

 

Alternatively you could add the additional java preference directly into the netlogo_gui.sh or netlogo_headless.sh scripts

 

JVM_OPTS=(-XX:MaxRAMPercentage=50 -Dfile.encoding=UTF-8   -Dnetlogo.libraries.disabled=true -Dnetlogo.extensions.dir="${BASE_DIR}/extensions" -Dnetlogo.models.dir="${BASE_DIR}/models" --add-exports=java.base/java.lang=ALL-UNNAMED --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=java.desktop/sun.java2d=ALL-UNNAMED  --add-exports=java.desktop/com.apple.laf=ALL-UNNAMED)

 

You can set the value to false, or remove that preference if you want to allow the updates.

 

Please let us know if this solves your problem.

 

• Aaron

 

 

-- 

Aaron Brandes, Software Developer

Center for Connected Learning and Computer-Based Modeling

 

 

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[Dapeng Dong]

Thanks to everyone for your suggestions, especially to Aaron. Your solution works perfectly for me!!!

For anyone experiencing the same issue on Linux (Ubuntu 20.04LTS), the config files are in the "NetLogo-6.04.0-64/lib/app/" folder.

Best,

Dapeng

[Stephen Guerin]

Solo

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