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I just had this issue when I moved my computers onto a new network, where they got assigned new nonstatic IPs by DHCP. The fix which worked for me was:

set ROS_HOSTNAME on robot PC to its own ip,

set ROS_HOSTNAME on base PC to its own ip

set ROS_IP on robot PC to base IP

set ROS_MASTER_URI to base IP:11311 both machines.

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