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new version of JATOS (3.7.2) doesn't transfer data

Hey everyone,

In the middle of February I've set up new JATOS server on a DigitalOcean droplet (8 GB Memory / 4 AMD vCPUs / 160 GB Disk / FRA1). I've followed the instructions from JatosDocumentation while setting up the server and everything seemed fine until I tried to test a few studies that I had imported.

The tasks are running fine until the end when the message "Transferring data, please wait a few moments" appears. The message stays there endlessly until I close the tab. When I check the results section I can see that a worker/participant had been counted but no data has been transferred, and the data size is 0b. The same thing happens when I close the task in the middle, the message "Aborting experiment, please wait a few moments" stays forever and no data has been saved after I close that tab.

This doesn't seem to be related to the memory size of the task, (as I was suspicious at the first hand) since it also happened with the small-sized OSWEB files which had a small number of variables. On the other hand, those tasks run pretty fine and the data is being saved if I import those studies on the other JATOS server, which is running on an older version (3.6.1).

So, I'm not sure should I edit some settings of my DigitalOcean docker, or JATOS itself in order to fix this issue with the data saving on the new server. I would appreciate any help, thank you very much in advance!

Kindest regards,



  • Hi Uroš,

    If you try your study on, does it work there, does it send result data? I try to figure out if your issue is some problem in JATOS or in your setup.



  • Hey Kristian,

    thank you for the fast response!

    I've tried out my study on and everything is ok with the data. So, I believe there was some mistake I've made while creating the droplet.

    Something comes to my mind, the script I've added in the User data while creating the droplet was:


    # Run JATOS as docker container

    docker run -d --restart=always -p 80:9000 jatos/jatos:latest

    Now, I've noticed that the script on the screenshot at the JatosDocumentation is different:


    # Run JATOS as docker container

    docker pull jatos/jatos:latest

    docker run-d --restart=always -p 80:9000 jatos:/jatos:latest

    Do you think that this could be the problem? Can I edit the user data after I've already created a droplet?

    Thank you so much in advance,


  • Hey Kristian,

    just to let you know that I've updated my JATOS from 3.7.2 to 3.7.3 (I've just noticed that newest version) and the problem described above has been solved! :)

    But, now I'm dealing with the same issue as described here, the results can't be exported.

    I'll try the instructions you've given on that discussion.

    Thanks for the help!


  • Hi Uros,

    Great to here that an upgrade to 3.7.3 solved your issue. The underlying problem then was the bundling of jatos.js with webpack.

    About the new issue: I'm on it. It's about streamsaver.js.



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