I think its not very clever to have only nodes with the same PRTG version to be able to connect to the master node, because obviously it is not always that you'll find the failover node being updated but the master.
Cluster: Access denied for node at A.B.C.D:49168 (Incorrect software version)
If the node wants to join a cluster and the cluster access key is correct then it should be fine to connect to the master, and then the master will then update the failover with the current PRTG version
Please reconsider your setup
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