The Dude server on my network is an x86 machine. It was running fine under 6.19, monitoring well over 100 devices on 8 submaps.
I upgraded it to ROS 6.20. After that point, it would "actively refuse connection" from all the same Dude clients it used to work with before.
I downgraded it to ROS 6.19. Now it lets clients connect again--and my map is gone.
Uh, guys? Upgrading ROS isn't supposed to break The Dude, and downgrading certainly shouldn't wipe out the network map and create hours of rework!