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I have a problem with Gazebo, probably connected to the servers but I'm not 100% sure. I was working on my project for a couple hours today, everything was working fine. I changed one thing in a non-gazebo package and did a full 'colcon build'. No errors. I then started my simulation and the GUI never showed up anymore. Terminal output would get stuck at:

[create-4] [INFO] [1763317815.972450938] [ros_gz_sim]: Requesting list of world names. [create-4] [INFO] [1763317820.972748129] [ros_gz_sim]: Requesting list of world names. [create-4] [INFO] [1763317825.973198474] [ros_gz_sim]: Requesting list of world names. [create-4] [INFO] [1763317830.973585792] [ros_gz_sim]: Requesting list of world names.

I tried killing every running gazebo instance there was, deleting build, install and log. I ran an entirely new clean container with my packages. I tried changing my IGN_IP like suggested [here][1].

Still, nothing works. I guess it could be something with the gazebo servers? Just never happened to me before.

I am using:

  • Ubuntu 24.04.02
  • ROS 2 Jazzy
  • Gazebo Harmonic v 8.9.0

EDIT: I think disabling the firewall with sudo ufw disable like proposed [here][2] works. [1]: https://robotics.stackexchange.com/questions/117672/gazebo-fortress-stuck-requesting-list-of-world-names [2]: https://github.com/gazebosim/gz-sim/issues/38

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  • $\begingroup$ I guess it could be something with the gazebo servers? ... is that the question that you want to ask? $\endgroup$ Commented Nov 16 at 18:43
  • $\begingroup$ I guess so. It somehow started working again today though. Nevertheless, pretty weird. $\endgroup$ Commented Nov 17 at 21:09

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