[Bug] MicroXRCE Agent fails to connect

[Apoorv-1009]

Describe the bug

Me and my friend are using the PX4 autopilot with ROS2 for a project, and initially we were getting each others topics when running ros2 topic list, so we then added ROS_LOCALHOST_ONLY=1 in our zshrc files. But recently, our MicroXRCE agent is giving small issues:
Running make px4_sitl gazebo-classic, the MicroXRCE agent connects, but running ros2 topic list does not give any topics
Running ./Tools/simulation/gazebo-classic/sitl_multiple_run.sh -m iris -n 1, the MicroXRCE agent simply does not connect, and so we dont get topics
May I know any possible reason for this problem? Thanks

To Reproduce

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Expected behavior

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Screenshot / Media

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Flight Log

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Software Version

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Flight controller

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Vehicle type

Multicopter

How are the different components wired up (including port information)

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Additional context

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