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I Faced the similar issue when i modified the network configuration of Ubuntu based PC , after this modification all the ros2 publisher subscriber communication was stopped and i was not able to get any result using cli tools of ROS2.

The only thing i done was reverted the network configuration changes and rebooted the PC and than it started working again .

I do not know the exact cause of this issue but may be it is something to do with the IP address of the PC , if there is no IP address assigned than this issue will occur.

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