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# general
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@stocky-fall-82040 Are you using firewalld or soomething similar?
using iptables on upstream and downstream clusters
Also using RKE1
I just restored my 2.5.17 local cluster and everything is back to working as expected. Something happens during he upgrade process that is breaking communication or is not allowing downstream clusters to report or not allowing the local cluster to sync with the downstream clusters.
Check the ports opened from the documentation, for me temporrary stopping firewalld worked
Sometime you need to restart a single master node for them to connect after Rancher Migrations. Have you tried cordoning and rebooting a single master node in a downstream cluster?